I generally know what’s coming next when a parent asks about altering their child’s vaccine schedule: “I was reading Dr. Sears….”

Dr. Sears is a genius. No, not in an Albert Einstein or Pablo Picasso kind of way. He’s more of an Oprah or a Madonna kind of genius. He’s a genius because he has written a book that capitalizes on the vaccine-fearing, anti-establishment mood of the zeitgeist. The book tells parents what they desperately want to hear, and that has made it an overnight success.

Dr. Robert Sears is perhaps one of the best-known pediatricians in the country. The youngest son of Dr. Bill Sears, the prolific parent book writer and creator of, Dr. Bob has become the bane of many a pediatrician’s existence. He has contributed to his family dynasty by co-authoring several books, adding content to the family website, and making myriad TV appearances to offer his sage advice. But Dr. Bob is best known for his best-selling The Vaccine Book: Making the Right Decision for your Child. This book, or at least notes from it, now accompanies many confused and concerned parents to the pediatrician’s office. Parents who have been misled by the onslaught of vaccine misinformation and fear-mongering feel comforted and supported by the advice of Dr. Sears, who assures parents that there is a safer, more sensible way to vaccinate. He wants parents to make their own “informed” decisions about whether or how to proceed with vaccinating their children, making sure to let them know that if they do choose to vaccinate, he knows the safest way to do it. And for $13.99 (paperback), he’ll share it with them.

In the final chapter of his book (entitled “What should you do now?”), after reinforcing the common vaccine myths of the day, Dr. Sears presents his readers with “Dr. Bob’s Alternative Vaccine Schedule.” He places this side-by-side with the schedule recommended by the American Academy of Pediatrics and the CDC’s Advisory Committee on Immunization Practices. He then explains why his schedule is a safer choice for parents who chose to vaccinate their children. Without a doubt, the alternative vaccine schedule is among the more damaging aspects of this book. It’s the part that gets brought along to the pediatrician’s office and presented as the plan going forward for many parents today. But the book is also dangerous in the way in which it validates the pervasive myths that are currently scaring parents into making ill-informed decisions for their children. Dr. Sears discusses these now common parental concerns, but instead of countering them with sound science, he lets them stand on their own as valid. He points out that most doctors are ill-equipped to discuss vaccines with parents, being poorly trained in the science of vaccine risks and benefits. He then claims to be a newly self-taught vaccine expert, a laughable conceit given the degree to which he misunderstands the science he purports to have read, and in the way he downplays the true dangers of the vaccine-preventable diseases he discusses in his book. He then provides parents with what he views as rational alternatives to the recommended vaccination schedule, a schedule designed by the country’s true authorities on vaccinology, childhood infectious disease, and epidemiology.

So what does Dr. Sears have to say, exactly, about the risks of vaccines, and just how out of touch is he with medical science and epidemiology?

Validating the untruths

Public versus individual health

It is not uncommon for people to be confused about how public health measures relate to personal or individual health. With regard to vaccines, some feel that recommendations made “for the good of the public” may not necessarily be for the good of the individual. Some feel that while they may understand the rationale for vaccinating on a societal level, they are unwilling or afraid to place the burden of potential vaccine risks on their child. Dr. Sears falls for this line of thinking, and leads parents to believe that certain vaccines protect the community but not the individual child. He gives polio as an example, stating that the risk of polio is zero, and that therefore the vaccine does not protect the individual child from disease. This, of course, is untrue. While new cases of polio no longer arise in the United States (thanks to the success of the polio vaccine) they still do in other areas of the world. As is true for many infectious diseases, imported cases and potential outbreaks are a quick airplane flight away. The more unvaccinated children we have, the more likely an imported case will lead to larger outbreaks of disease. So yes, vaccinating protects the individual child as well as the community at large. Ironically, polio would likely have been eradicated from the earth by 2002 had it not been for the propagation of a vaccine myth. In the impoverished Indian state of Uttar Pradesh (which, in the year 2000, accounted for 68% of all polio cases in the world), a myth that the polio vaccination campaign was really a government conspiracy to sterilize children prevented that campaign from accomplishing its true mission of ridding the world of this horrible disease.

Of course herd immunity, an epidemiological concept, is of vital importance to public health. We know that Dr. Sears understands at least this much, because he advises parents who fear giving their children the MMR vaccine not to tell their neighbors, lest too many parents develop similar fears. He warns that an increasing number of unvaccinated children will result in a resurgence of the disease. He couldn’t be more correct. Enlarging pockets of unimmunized and underimmunized children around the country have already resulted in outbreaks of disease. These vaccine-preventable outbreaks are just harbingers of worse outbreaks yet to come, should this trend continue.

Throughout his book Dr. Sears highlights common parental concerns about vaccines. He follows these not with fact-based discussions, but with subtle (and often not so subtle) words of reinforcement. For example, Dr. Sears often downplays the potential danger of vaccine preventable diseases, or the risk of infection for the unimmunized child. Although the book is rife with such misinformation, I will limit my discussion to just a few examples to give a sense of the distortions involved.


In his chapter on the DTaP vaccine (against diphtheria, tetanus, and pertussis), in the “Reasons some people choose not to get this vaccine” section, Dr. Sears states:

In truth, tetanus is not an infant disease…Also, diphtheria is virtually non-existent in the United States. So, one could create a logical argument that a baby could skip the tetanus and diphtheria shots for a few years and be just fine.

Infant with tetanus

Perhaps Dr. Sears is unaware that tetanus is indeed a disease of infants, and potentially of anyone. And to make the case that because diphtheria (or any infectious disease) is not endemic to the United States it is therefore not a threat to unimmunized children, betrays Dr. Sears’ naiveté when it comes to basic principles of epidemiology and infectious disease. Epidemiology and history has shown us that when vaccination rates drop sufficiently, outbreaks of seemingly vanquished diseases return with a vengeance. Diphtheria is no exception. In the newly independent states of the former Soviet Union, declining childhood and adult vaccination rates against diphtheria have played a major role in a massive epidemic of that deadly disease. And as we see more and more pockets of unvaccinated children around this country, we are beginning to see the reemergence of horrific vaccine preventable diseases. Recent outbreaks of invasive Hib disease and of measles should remind us how important it is to maintain our herd immunity against these scourges of the not-so-distant past. Of course, Dr. Sears never challenges the unsupported concerns about vaccine risks. He simply restates these concerns, and then adds fuel to the fire, supporting the irrational fears that led to this growing trend of underimmunization.

Epidemiological missteps

Dr. Sears’ understanding of epidemiology and vaccine adverse event surveillance is startlingly poor. He purports to break new ground by doing the first-ever statistical vaccine risk-benefit analysis for parents. Unfortunately, his calculations are meaningless as he misunderstands the most basic concepts, like cause-and effect, and fails to grasp the significance of vaccination rates in determining the likelihood of contracting a vaccine-preventable disease. Dr. Sears bases the risk of a child suffering a severe vaccine reaction on his analysis of VAERS data. VAERS (the CDC’s Vaccine Adverse Events Reporting System) is a passive surveillance system that everyone (doctors and patients alike) is encouraged to use anytime a vaccination is followed by an adverse event, whether or not they suspect the vaccine is the actual cause of the event. Being an open, voluntary, passive reporting system, VAERS is susceptible to fraud and abuse, as anyone can submit a report. The purpose of the system is to give a very broad look at possible unforeseen events related to vaccination. It is a screening tool, from which trends can be observed, possibly triggering true validated analyses. Raw VAERS data simply cannot be used to analyze the risk of vaccine reactions, because the data does not tell us anything about causality. Despite this, Dr. Sears and others continue to misuse VAERS data, representing it as a true estimate of vaccine adverse events. To quote the CDC:

The purpose of VAERS is to detect possible signals of adverse events associated with vaccines. Additional scientific investigations are almost always required to properly validate signals from VAERS and establish a cause and effect relationship between a vaccine and an adverse event.

But Dr. Sears uses VAERS data to come to the conclusion that “for about every 100,000 doses [of vaccine], one person suffered a severe reaction.” He fails to mention that VAERS data tells us absolutely nothing about the risk of developing a vaccine reaction, severe or not. He then takes this number and, by assuming every vaccine dose has the same risk attached to it of creating a severe reaction, determines that a child has a 1/100,000 chance of developing a severe reaction for each vaccine dose he receives. By using VAERS data inappropriately and misleadingly, Dr. Sears concludes that:

The risk that any one child will suffer a severe reaction over the entire, twelve-year vaccine schedule is about 1 in 2600.

He then calculates that:

The risk of a child having a severe case of a vaccine-preventable disease is about 1 in 600 each year for all childhood diseases grouped together.

And then asks parents the ultimate question, concluding with an example of his trade-marked, passive-aggressiveness,

Is vaccinating to protect against all these diseases worth the risk of side effects? That’s the million dollar question.

Of course, the answer is so overwhelmingly “yes” that it’s difficult to conjure up the energy to respond to Dr. Sears’ misleading analysis. Not only does he start his statistical sleight-of-hand by inappropriately using VAERS data, he then calculates the risk of acquiring a vaccine preventable disease using current disease incidence rates. What he doesn’t acknowledge is that those rates are predicated on current vaccination rates. The reason a child today is at low risk for contracting these diseases is precisely because our vaccination rates are so high!


Dr. Sears fails to mention that, while the incidence of severe invasive Hib disease is currently very low, it was actually common in the pre-vaccine era. In the years before the introduction of the vaccine in 1987, approximately 1 in 200 children below the age of five acquired invasive Hib disease. He admits that the vaccine is responsible for keeping the disease at bay, but then states:

HIB is a bad bug. Fortunately , it’s also a rare bug, so rare that I haven’t seen a single case in ten years…Since the disease is so rare, HIB isn’t the most critical vaccine.

If parents follow the extremely dangerous, backwards logic of Dr. Sears, we are certain to see the incidence of vaccine-preventable diseases rise, as we are now just beginning to see in the US. Rest assured, it doesn’t take long for a disease to reemerge once vaccination rates drop.


Dr. Sears’ discussion of measles consists of a series of downplayed statements. He describes the rash as one that “can look similar to rashes…of other diseases, so its not easy for a doctor, much less a parent, to recognize.” And he states that the disease is “transmitted like the common cold”. The clinical presentation of measles is striking and very difficult to mistake for any other illness. As I was taught during my residency, there’s no such thing as a mild case of measles. Every child with the disease is very ill appearing. And, while it is transmitted by respiratory droplets like the common cold, it seems the sole reason for making this statement is, again, to liken it to other, less dangerous viral infections. In answer to his self-posed question “Is measles serious?” Dr. Sears replies:

Usually not. Most cases, especially in children, pass within a week or so without any trouble. However, approximately 1 in 1000 cases is fatal…Now that measles is rare, many years go by without any fatalities.

He then makes the astoundingly misleading statement,

The possible complications of measles, mumps, or rubella are very similar to the side effect of the vaccines themselves.

Because I can’t fathom he is that ignorant of the facts, I am inclined to believe that Dr. Sears is simply being deceitful. Here are the facts about the complications of measles:

  • One in 1,000 cases of measles results in encephalitis, with a high rate of permanent neurological complications in those who survive.
  • Approximately five percent develop pneumonia.
  • The fatality rate is between one and three per 1,000 cases.
  • Contrary to Dr. Sears’ statement, death is most commonly seen in infants with measles.
  • Subacute sclerosing panencephalitis (SSPE) is a rare complication of measles infection that occurs years after the illness in approximately 10 of every 100,000 cases.

Here are the facts about complications of the measles vaccine:

  • It causes fever and a mild rash in 5-15% of recipients.
  • 0.03% will have a febrile seizure – likely not a result of the vaccine itself, but simply a child’s individual predisposition to febrile seizures.
  • One in 10,000 children will have a more serious event following the vaccine, such as a change in alertness, a drop in blood pressure, or a severe allergic reaction.
  • Approximately 1 in 25,000 cases is associated with an asymptomatic drop in the blood platelet count, which quickly returns to normal without any consequences.

Dr. Sears uses reactions listed in the vaccine package insert as if they are true vaccine side effects. This is analogous to using VAERS data to draw conclusions about vaccine reactions, since there is no evidence that any of these are causally related. Most side effects listed in package inserts occur at the same rate as background or placebo rates. Nevertheless, Dr. Sears goes out of his way to reinforce parental concerns, even though the facts are right at his fingertips. The section entitled “Reasons some people choose not to get this vaccine”, that occurs at the end of each vaccine discussion, further reinforces parental fears by simply restating parental concerns with no attempt at setting the facts straight. In a box at the end of his discussion of the hepatitis B vaccine, he does attempt to explain the concept that temporality does not imply causality. Ironically, he states in this explanation:

Parents who have watched helplessly as their child develops neurological problems within weeks of being vaccinated will probably always be 100 percent convinced that the vaccine caused the problems. The fact that neurological complications are listed in the product inserts lends credibility to their case.

And so does Dr. Sears with the insidious, misleading messages he uses in his book. He concludes his discussion of causality with this confused statement:

I’m sure the truth of the matter is somewhere between causality and coincidence. Hopefully someday we will know for sure which side effects are truly vaccine related.

Of course, we will never “know for sure” if every report of an extremely rare event following a vaccine is causally related or not. We continue to monitor trends and conduct rigorous surveillance, and follow that with sound epidemiological studies when concerns arise. This is why we can say, with good confidence, that these vaccines are extremely safe, and that Dr. Sears’ concerns and equivocations are misleading at best.

Toxic shots

Throughout his book, Dr. Sears discusses the common fears concerning vaccine dangers, never correcting when these fears are based on myth or misinformation. Rather, he presents them in a “we just don’t know enough” manner (even when we do), or as matters of fact (even when they’re not). Dr. Sears raises the concern in his book that the recommended schedule of childhood vaccines may pose a danger. He suggests that we just don’t know if the chemicals contained in the vaccines (which he lists in alarming fashion) may be too great of a burden for the developing child.


In the very first page of the book’s preface, Dr. Sears tells his readers that he is “not going to discuss, at length, mercury or thimerosal in vaccines because, thankfully, these have been taken out of virtually all vaccines” (my emphasis). This is followed by more language that makes it clear he believes thimerosal was a dangerous additive, and that the little remaining thimerosal in the vaccine supply (contained in one form of the influenza vaccine) is still a risk. Of course, we know that the thimerosal in vaccines was unlikely to ever have been a danger to children, but Dr. Sears uses the same old misinterpretations of the science and conspiracy theories to arrive at the conclusion that it was. In fact, he point blank states that “vaccine manufacturers knew that we were overdosing babies with mercury, but no one in the medical community realized the possible implications for almost ten years.” This kind of fear mongering is no different than that spewed by the folks at Generation Rescue, and lacks any basis in science. In his section on vaccine ingredients, Dr. Sears (again, either naïvely or dishonestly) discusses the rise in the rate of autism diagnoses as possibly a result of thimerosal in vaccines. He cites the same tired and poor references (and an article from The LA Times) we’ve heard before from the likes of Jenny McCarthy, and then asks “so who do we believe?” Again, that question is left hanging.


Of particular concern to Dr. Sears is the potential dangers of aluminum, which has become his new post-thimerosal villain. Although he worries aloud in his book that “aluminum may end up being another thimerosal”, Dr. Sears is unaware that such a comparison doesn’t exactly strike fear in the hearts of the scientific community.

Many vaccines contain aluminum as an adjuvant. An adjuvant is a substance that boosts the ability of a vaccine to induce an immune response. It acts locally at the site of injection, as a signal to the immune system, drawing a heightened response to the injected vaccine. Ironically, without adjuvants we would need a larger dose of the vaccine to induce an immune response. I doubt that would go over well in anti-vaccine circles.

Unfortunately, Dr. Sears’ concerns about aluminum are the result of a distorted reading of what is known about aluminum toxicity and the risk of vaccines in children. In discussing “controversial ingredients”, he states:

…some studies indicate that when too many aluminum-containing vaccines are given at once, toxic effects can occur.

In fact, no such studies exist. He does correctly state that there is very little known about the pharmacokinetics of intramuscularly injected aluminum as it occurs in vaccine adjuvants, but he goes on to distort what we do know about aluminum toxicity into a rationale to fear our current vaccine supply and schedule. For instance, we know that aluminum has been blamed for producing neurotoxicity in some patients with renal failure on long-term dialysis, and in some extremely premature infants given prolonged courses of aluminum-containing intravenous nutritional solutions. But this is not comparable to the exposure of healthy infants to adjuvant-containing vaccines given intramuscularly on a few, discrete occurrences over a period of months. Similar to the way the safety data for methylmercury is often incorrectly applied to the ethylmercury in thimerosal (and incorrect inferences of toxicity made), Dr. Sears uses safety limits set for something else, and incorrectly applies them to the aluminum in vaccine adjuvants.

Dr. Sears uses the FDA’s maximum permissible level (MPL) of aluminum for large volume bags of intravenous fluids given chronically to premature infants (25 µg/L), and extrapolates it to adjuvant-containing vaccines. He also uses the number 5 µg/kg/day as the amount of aluminum found to cause toxicity in some premature infants receiving intravenous feeding solutions that contain aluminum. What he doesn’t mention is that the 25 µg/L number comes from studies showing that this concentration produces no tissue aluminum loading, and that it was chosen to allow room for other exposures. In fact, it is estimated that the aluminum in these intravenous feeding solutions accounts for only 10-15% of the total parenteral aluminum intake per kg body weight that premature infants receive in a given day while in intensive care. The number was set low to leave room for the other sources of parenteral aluminum these infants receive. Still, Dr. Sears uses this number as his standard against which he compares the aluminum content of vaccines. This is misleading for a number of reasons. First, the 25 µg/L MPL for parenteral feeding bags says nothing about the maximum amount of aluminum that can be safely injected. This is obvious as the number is expressed as a concentration, not as an absolute amount of aluminum. The average premature infant would likely receive 100 ml/kg/day of solution, and therefore roughly 2.5-5 µg per day of aluminum from this source. Again, accounting for only about 10-15% of the parenteral aluminum the infant would receive in a given day. Dr. Sears does acknowledge that the number isn’t a maximum permissible amount of aluminum for injection, but he uses it anyway stating, in essence, that it’s all we’ve got. But it isn’t all we’ve got, as we shall see in a moment.

The fact that these intravenous, aluminum-containing solutions are administered continuously over long periods of time, whereas vaccines are administered in discrete unit doses at intervals spaced out over time, is also not taken into consideration in Dr. Sears’ discussion. But his use of the FDA limits for intravenous feeding solutions is misleading also because it ignores the difference between intravenous and intramuscular or subcutaneous injection of aluminum, as in the case of vaccines. In fact, there is evidence, which Dr. Sears must have missed in his exhaustive review of the literature, that the aluminum from vaccines behaves differently than intravenously administered aluminum and that the body burden of aluminum from vaccines is not so concerning when placed in the context of the background body burden of aluminum.

One piece of evidence that the aluminum in vaccines is handled by the body quite differently than the aluminum in intravenous solutions comes from studies looking at the intramuscular injection of aluminum-containing adjuvants into rabbits. Rather than entering the blood stream directly and accumulating in tissues, as with intravenously injected aluminum, intramuscularly injected aluminum-containing adjuvants are first dissolved by organic acids in the interstitial fluids, and are then rapidly eliminated.

Another reassuring look at aluminum exposure from vaccines comes from an analysis by Keith, et al. from the ATSDR. They looked very closely at the way in which all sources of aluminum exposure in the infant contribute to the total body burden of aluminum, including inhalation, oral, dermal, and vaccine exposures. They took into consideration uptake, transfer from the blood, release from the injection site, distribution patterns, and retention and elimination rates of aluminum. They used the Priest formula to assess the fate of aluminum once it has entered the body via any route.

  • R = 0.354dt−0 .32 (where R is the retained fraction, d the uptake dose in mg Al, and t the time in days following uptake. The equation is summed for repetitive intakes such as with multiple vaccinations.)

Comparison of the aluminum body burden from vaccines to that from ingested breast milk, in relation to the oral MRL for aluminum for infants at the 5th and 50th percentiles for weight, is shown in the figure below (taken from the original article). The analysis assumes injections of vaccines according to the following schedule, with the corresponding aluminum content:

  • Birth: Hep B (250 µg)
  • 2 months: Hep B + DTaP (1100 µg)
  • 4 months: DTaP (850 µg)
  • 6 months: Hep B + DTaP (1100 µg)
  • 12 months: DTaP (850 µg)

While this leaves out the PCV and Hib vaccines, only one brand of Hib vaccine contains aluminum, and the PCV vaccine contains only 125 µg of aluminum. Thus, this analysis accounts for the bulk of the aluminum that comes from the vaccine series.

Aluminum body burden

As can be seen in the figure, aluminum spikes occur on the day of injection, followed by rapid elimination within a few days. Despite slight and brief overlaps between the vaccine and MRL curves at the time of vaccination, the vaccine curves always fall between the dietary intake curves and the MRL curves. The authors conclude that, in the context of the overall body burden of aluminum with which infants are born and which is added to by ongoing oral, inhalational and parenteral sources, vaccines are likely to constitute only a minor, transient part.

While there is good reason to be confident that the aluminum in vaccines is not the dreaded neurotoxin Dr. Sears fears it is, in his book he suggests otherwise. His mantra is that there are now so many vaccines in the routine schedule that we are overloading our children’s bodies with toxic aluminum. This is neither borne out by the science, nor is it likely given what we know about aluminum and the way in which children are exposed via vaccinations.

Other scary sounding vaccine constituents

In addition to the hot-button concerns discussed above, Dr. Sears highlights a number of other vaccine constituents that “might be of concern to some parents.” In typical style, he doesn’t explain why these concerns are unfounded, but instead makes sure they are listed in alarming fashion so that parents can make their own “informed” decision about whether or not to be concerned. Again, many parents appreciate this approach as one that is non-condescending. What it really is, however, is deceptively lacking in scientific honesty.

Animal and human tissues – Dr. Sears lists items like “cow fetus serum” in the “What ingredients are in the vaccine” sections of each vaccine he discusses. Because the reader doesn’t realize the absolute lack of importance to this fact, he is merely raising the specter of danger without truly informing. He mentions the issue of potential contamination with prions and the risk of transmitting mad cow disease, even though such a risk does not exist. Dr. Sears discusses the contamination of an early polio vaccine in the 1950’s with SV40, a monkey virus, as an example of the potential dangers of using animal and human cell cultures in vaccine manufacturing, although this actually posed no risk at the time. Here’s the gratuitous, completely uninformative way Dr. Sears concludes his section, seemingly meant to shock and invoke fear, all under the guise of just giving the facts:

For review, here is a list of the various animal or human tissues used to make vaccines:

  • Human blood proteins (albumin)
  • Human lung cells
  • Human fetal lung cells
  • Human cell lines
  • Cow serum (the liquid part of blood)
  • Cow heart-muscle extract
  • Cow tissue extract
  • Monkey kidney cells
  • Guinea pig embryo cells
  • Chicken embryos
  • Chicken kidney cells
  • Chicken eggs

I’m certain this list is frightening to some parents, but it needn’t be. Unfortunately, Dr. Sears does nothing to honestly inform his readers.

Formaldehyde – Dr. Sears discusses what he considers to be the toxic properties of formaldehyde – that it’s carcinogenic and causes kidney and genetic damage. He follows this with:

I could not find information on injected formaldehyde. Fortunately, the amount in each vaccine is minuscule.

Perhaps he could also have mentioned that formaldehyde is naturally present in the bodies of infants, at a level far greater than that contained in the vaccines they receive, and that formaldehyde does not appear to be carcinogenic to humans, or that animals injected with extremely large quantities of formaldehyde also fail to develop cancers.

MSG – The controversial nature of MSG is reviewed, and readers are reminded that “large quantities” can cause nervous system damage “similar to Alzheimer’s disease.” Again, he follows this with the fact that vaccines contain only trace amounts of MSG.

2-Phenoxyphenol – The book informs us that this chemical causes reproductive defects, is an irritant, and can be found in nasty things like solvents. Again, Dr. Sears ends by stating that it’s found in “minuscule” amounts in vaccines.

Sodium deoxycholate – Another toxic substance, harmful to the eyes and lungs, found in minuscule amounts in vaccines.

Polysorbate 80 and 20, EDTA, Sodium borate, Octoxynol – For some reason these chemicals get a complete pass. Dr. Sears simply states that, in the tiny amounts found in vaccines, they are “considered harmless”. I’m not sure why these toxins are considered harmless in these trace amounts, while the others are not given this quick vote of confidence. Nor am I sure which authorities he is referring to who have made these declarations of harmlessness. Perhaps Dr. Sears is unaware that sodium borate is a chemical used in metal solder, as a laboratory buffer, has been banned as a food additive in Indonesia, and may cause liver cancer. And I’m surprised he didn’t mention that polysorbate 80 can increase the risk of blood clots, stroke, and heart attack. Perhaps he didn’t want to sound too alarmist.

Dr. Bob’s selective and alternative vaccine schedules

The final products of The Vaccine Book are the two schedules Dr. Sears proposes for different types of concerned parents. The ‘Selective Schedule” is offered to parents who “otherwise would have declined all vaccines”. For this schedule, Dr. Sears chooses vaccines he feels are the most important, because the diseases they protect against are either the most dangerous and/or the most common, and have the least severe potential side effects. The “Alternative Schedule” (the one I see most commonly) is intended for parents who want to vaccinate, but who have concerns about vaccine safety, a group he correctly describes as “growing in recent years as the media and the internet bring theoretical problems with vaccines to light.” This book, of course, is part of the mass-appeal stream of misinformation contributing to that growing trend.

The “Alternative Schedule”, as explained by Dr. Bob, accomplishes the following:

  1. It spreads out vaccines to give only one aluminum-containing vaccine at a time. This is done so “infants can process the aluminum without it reaching toxic levels”. Really? Can Dr. Sears cite the references for this scientific sounding rationale?
  2. It exposes infants to the chemicals of only two vaccines at a time. Similar to the above anti-scientific rationale, this is done to spread out exposure to “chemicals”, so the infant can process them without risk. In a statement that clearly reveals his lack of scientific understanding, Dr. Sears then states, “…we don’t know whether this precaution is necessary, but it’s reasonable.” [Reasonable: 1 a: being in accordance with reason <a reasonable theory> b: not extreme or excessive <reasonable requests> c: moderate, fair <a reasonable chance> <a reasonable price> d: inexpensive 2 a: having the faculty of reason b: possessing sound judgment <a reasonable man>] No matter how you read it, reasonable it isn’t.
  3. It gives at most 2 vaccines at a time to limit potential side effects. Again, Dr. Sears states we don’t know if more simultaneous vaccinations leads to a greater likelihood of side effects, but concludes that it’s “a reasonable precaution.” We actually do know, contrary to very popular belief, that infants can easily handle all of the recommended vaccines, and then some.
  4. It begins with “the most important” vaccines. Dr. Sears would have his readers believe he has come up with a good schedule of vaccination based on giving vaccines that protect against the most serious diseases first. His readers would be better informed if they were told how the AAP/CDC recommended vaccine schedule is designed. How the country’s leading experts on vaccinology, infectious disease, and epidemiology determine which vaccines are most important and when they are best given – balancing when they are most effective at inducing an immune response and when the risk of disease and adverse disease outcome is greatest. Interestingly, the actual order of the real vaccine schedule is the same as Dr. Bob’s.
  5. “It delays shots for diseases that are usually fairly mild for infants”. He gives as examples hepatitis A and rubella. The first dose of both the hepatitis A and rubella vaccines are actually recommended at 12-15 months of age. They are not part of the vaccine series given in the first year of life. Further, Dr. Sears’ rationale for delaying rubella vaccine misses the point entirely. Rubella, while usually a mild illness, is not on the vaccine schedule because of the severity of the illness it causes. It is recommended because women infected (usually by children) during the first trimester of pregnancy, have a 50% chance of delivering a baby with severe congenital defects. The vaccine has been successful at nearly eliminated this horrific occurrence.
  6. “It delays the shots for diseases that a baby is extremely unlikely to catch during the first few years of life”. He gives as examples hepatitis B and polio. As I discussed earlier, this rationale uses flawed, backwards logic. Babies are at low risk for contracting polio because there is no home grown polio in this country. That is precisely because we vaccinate everyone in infancy. Without a susceptible host, the disease disappears. Unfortunately, because of religious opposition and other myths, the same cannot be said about every area of the world. As a result, we have yet to completely rein in this horrible disease.Although hepatitis B is not common in infancy as long as the infant’s mother is not a carrier (or infected) during pregnancy, it is still a risk. Prior to routine vaccination against hepatitis B, 18,000 children per year were infected. Half of these children did not contract it from their mother at the time of birth. Because the disease can be severe, chronic, and can lead to destruction of the liver or liver cancer, and because it can be spread through casual contact with contaminated objects like toothbrushes, it is recommended that all children get vaccinated as early as possible. Because the vaccine is so safe (it does not cause a hepatitis-like illness as Dr. Sears warns his readers), and it can be transmitted casually (it’s not just a sexually transmitted disease as Dr. Sear states), it is recommended during infancy.
  7. “It gives live-virus vaccines one at a time so that a baby’s immune system can deal with each disease separately.” Here Dr. Sears travels further from science than he does perhaps anywhere in his book. First, he refers to a live virus vaccine as a “disease”. This is either a serious mistake, purposeful deceit, or dangerous ignorance on his part. He discusses the potential dangers of giving the MMR vaccine as a combined vaccine, and recommends separating it into M, M, and R components and spreading them out over time. He then states that:

    it’s probably okay to give the combination MMR booster at age 5, when a child’s immune system is more mature [my emphasis].

    First of all, we know the vaccine is effective at invoking a protective immune response when given at the recommended ages (12 months, and 4-6 years). The notion that multiple vaccines can somehow overwhelm an infant’s immune system indicates an absolute lack of understanding of how the immune system responds to vaccines, and is thoroughly refuted by science. I will not go into depth here discussing the enormity of the evidence refuting any causal association between the MMR vaccine and autism, nor discuss the apparent fraud that was perpetrated in the publication of the original paper the made this issue the phenomenon it has become. Others have exhaustively covered that topic. I will say that for Dr. Sears to perpetuate this extremely dangerous myth is deplorable. He has the audacity to pander to the fears of parents by stating:

    Splitting the MMR into separate components is thought by some researchers to decrease the risk of autism and other reactions, although medical science has not proven this to be so.

    I don’t know to whom he is referring when he writes “some researchers”. I do know (as should Dr. Sears) that there is not one shred of scientific support for the notion that a split MMR confers any benefit over the combination vaccine. It certainly can’t decrease the risk of autism, since the MMR does not cause autism. And there is no scientific evidence that it decreases the risk of any side effects. What it does do is increase the number of shots a child receives, increasing the time, expense, and pain involved. More importantly, it increases the amount of time a child is susceptible to disease. But the most damaging aspect of this kind of deceit is that it further erodes society’s understanding and trust in science. Tagging the statement, “although medical science has not proven this to be so” at the end, does nothing to exculpate him from this offense.

After explaining his alternative schedule, Dr. Sears cavalierly remarks that if he’s wrong about all of this, the worst-case scenario is that “you risk really annoying your doctor because you’re trying to think outside the box.” I’ve just discussed the real harm of this schedule. Applying the positive expression “thinking outside the box” in an effort to cast a positive spin on it is disingenuous. Thinking outside the box can be a good thing in science. But, unless we’re talking about quantum theory, not as a way of understanding science itself.

Dr. Sears claims to listen to parental concerns and to be impartial when it comes to whether or not, or how, to vaccinate. He says that, rather than tell them what to do, he prefers to give parents all the information they need to make their own, informed decisions. But instead of accurately discussing the science for concerned parents, correcting the pervasive vaccine myths and misinformation so prevalent in the media, on-line, and in our communities, he distorts, misinterprets, and misleads. Dr. Sears has either a very poor understanding of how to read the scientific literature, and of the scientific method itself, or he is intentionally misleading his readers. Either explanation indicates an unacceptable and egregious abuse of his public and professional responsibilities. Dr. Sears is not as blatantly anti-vaccine as others. In the beginning of the book he informs his readers that it “is not an anti-vaccine book” (his emphasis), and that other books over-emphasize the dangers of vaccines and do too much to scare parents. This is a nice set-up for the book, allowing parents to believe they are getting the straight, unbiased story from a doctor that really wants to inform. While Dr. Sears’ brand of fear-mongering is more subtle than some, it is at least as dangerous. Because of his family name and public persona, Dr. Bob has become one of the country’s most recognized pediatricians. And his plain language “parents know best” philosophy has attracted the admiration and trust of parents looking for authoritative validation of their fears, concerns, and beliefs. Unfortunately, Dr. Sears is good at repeating and reinforcing common parental fears and anti-vaccine myths, but is quite poor at reading the literature and understanding epidemiology. While he doesn’t overtly tell parents not to vaccinate, he certainly stacks the deck this way. In his discussion of each vaccine, his “reasons to vaccinate” section tends to downplay the risks of the disease. He “balances” this with a section called “reasons some parents choose not to vaccinate“. But I view this as simply his attempt to exculpate himself for being, in reality, an anti-vaccine spokesperson. For all intents and purposes, this gives parents every reason to feel confident that their rationale for not vaccinating is supported by sound reasoning. Dr. Sears rehashes and lends credence to the same debunked myths that have led to these parental fears in the first place, all under the guise of providing parents with “both sides” of the issue. Of course what he does is provide bits and pieces of good information alongside inaccurate and incorrect information, and asks parents to make an “informed” opinion.

With his best-selling book (it currently ranks at #414 on Amazon) Dr. Bob, along with a growing platoon of other prominent anti-vaccine spokespeople, is leading parents into a trap that not only threatens their own children’s health, but the health of the entire nation as well. Already, this anti-scientific groupthink has increased the number of children who are under or un-vaccinated, and has resulted in preventable death and disease. I hold Dr. Sears and the many vocal prophets of doom (like Jenny McCarthy, Paul Kirby, Robert Kennedy Jr., JB Handley, and Andrew Wakefield) personally responsible for the increasing prevalence of parental vaccine refusal and the ensuing return of vaccine preventable disease.



  • John Snyder, MD, FAAP, is an Assistant Professor of Pediatrics at Tufts University School of Medicine, and a practicing pediatrician at Amherst Pediatrics in Amherst, Massachusetts. Previously, he was Medical Director of the teaching clinic at Baystate Children's Hospital, and before that he was Chief of the Section of General Pediatrics and Medical Director of Pediatric Ambulatory Care at Saint Vincent's Hospital in New York City. Since 1994, Dr Snyder has been active in pediatric resident and medical student education with a particular interest in evidence-based pediatrics. His main area of interest is medical myth and the ways in which parents utilize information in making medical decisions for their children. One area of focus has been the vaccine myth, and he lectures frequently on this subject in both academic and community settings. His other activities have included: contributor to the Gotham Skeptic blog, member of the New York City Skeptics' board of advisors, and expert for ("A New Social Network on Health Founded by America's Top Doctors"). Dr Snyder graduated from Mount Sinai School of Medicine, completing his residency training in pediatrics at The Mount Sinai Hospital in New York City. He is board certified in pediatrics, and is a Fellow of The American Academy of Pediatrics. Dr. Snyder has no ties to industry, and no conflicts of interest regarding any of his writings. Dr. Snyder’s posts for Science-Based Medicine are archived here.

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Posted by John Snyder

John Snyder, MD, FAAP, is an Assistant Professor of Pediatrics at Tufts University School of Medicine, and a practicing pediatrician at Amherst Pediatrics in Amherst, Massachusetts. Previously, he was Medical Director of the teaching clinic at Baystate Children's Hospital, and before that he was Chief of the Section of General Pediatrics and Medical Director of Pediatric Ambulatory Care at Saint Vincent's Hospital in New York City. Since 1994, Dr Snyder has been active in pediatric resident and medical student education with a particular interest in evidence-based pediatrics. His main area of interest is medical myth and the ways in which parents utilize information in making medical decisions for their children. One area of focus has been the vaccine myth, and he lectures frequently on this subject in both academic and community settings. His other activities have included: contributor to the Gotham Skeptic blog, member of the New York City Skeptics' board of advisors, and expert for ("A New Social Network on Health Founded by America's Top Doctors"). Dr Snyder graduated from Mount Sinai School of Medicine, completing his residency training in pediatrics at The Mount Sinai Hospital in New York City. He is board certified in pediatrics, and is a Fellow of The American Academy of Pediatrics. Dr. Snyder has no ties to industry, and no conflicts of interest regarding any of his writings. Dr. Snyder’s posts for Science-Based Medicine are archived here.