Category: Vaccines

Two panels show how PD-L1 on tumor cells binds to PD-1 on T cells to block immune response, and how anti-PD-L1 or anti-PD-1 drugs block this interaction, allowing T cells to kill tumor cells.

The opposite of “turbo cancer”: COVID-19 vaccines sensitize cancer to immunotherapy

A new preliminary study published in Nature suggests that COVID-19 vaccines might actually boost the immune system to make immunotherapy more effective. If confirmed in followup studies, this result suggests that the vaccines do the opposite of causing "turbo cancer."

/ October 27, 2025
A gloved hand holds a vial labeled "COVID-19 Coronavirus Vaccine" next to a filled syringe, ready for injection. The background is blurred and light-colored.

The Effectiveness of COVID Vaccines

One of the common themes of SBM is that medical evidence can be very complex. In order to come to any robust conclusion about what the science says on any question you need to do a careful and thorough evaluation of all the relevant evidence, including plausibility as well as observational and experimental clinical evidence. Essentially we want to look at the...

/ October 22, 2025
Aluminum hydroxide

RFK Jr. is definitely coming for your vaccines, part 4: Aluminum edition (or: Everything old is new again…again)

Last week, news stories reported that HHS Secretary Robert F. Kennedy Jr. had convened an "aluminum working group." Among the "scientists" there are antivax scientists about whom I've been writing for over a decade. Everything old antivax is new again.

/ October 13, 2025
Robert F. Kennedy Jr. lying about vaccines again

Robert F. Kennedy Jr. weaponizes an old antivax trope in his quest to eliminate vaccines

People who keep whistling past the graveyard (of vaccines) to assure themselves that RFK Jr,. won't take away their vaccines are deluding themselves. One seven-minute video he posted last week shows that, weaponizing an old one deceptive antivax trope claiming that vaccines didn't do that much to improve global health.

/ October 6, 2025
Mark Blaxill

Mark Blaxill: Robert F. Kennedy Jr. resurrects another washed-up antivax activist

Last week, it was reported that Mark Blaxill had been hired at CDC. It looks like RFK Jr.'s resurrecting every washed up antivax crony he can find to staff HHS.

/ September 30, 2025
South Korea study

Here we go again: Another study is being misrepresented as evidence that COVID vaccines cause cancer

An eminent oncologist, cancer researcher, and cancer center director is promoting a study that seems to show—but, when critically examined, doesn't—that COVID vaccines are associated with increased cancer risk.

/ September 29, 2025
ACIP screenshot, day 2

Robert F. Kennedy, Jr. is definitely coming for your vaccines, part 3: Antivax rhetoric and incompetence at ACIP

The CDC's newly reconstituted antivax Advisory Committee on Immunization Practices met last week. The results weren't as horrific as I'd expected, but not for lack of trying. In this post, I'll focus on one presentation as a lens through which to look at the meeting as a whole.

/ September 22, 2025
Robert F. Kennedy Jr.

Robert F. Kennedy, Jr. is definitely coming for your vaccines, part 2: VAERS, the FDA, and ACIP

The Food and Drug Administration appears to be about to weaponize a classic antivax trope against COVID-19 vaccines, the abuse of reports to the Vaccine Adverse Events Reporting System to falsely portray them as deadly, even as news reports suggest that RFK Jr. will further restrict access to COVID-19 and three childhood vaccines. Here we go again.

/ September 15, 2025
Two syringes filled with blue liquid face each other, labeled "BENEFIT" on the left and "RISK" on the right, with their needles nearly touching in the center.

Unintended Side Effects HPV and Shingles Vaccines—Reason for Concern

While vaccine debate rages in social media and on Capitol Hill, examination of massive data sets reveals unanticipated effects of the human papilloma virus (HPV) and varicella-zoster (Shingles) vaccines.

/ September 9, 2025
Donald Trump and Robert F. Kennedy, Jr. (RFK Jr.)