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A nurse holds a syringe that contains a dose of the Pfizer COVID-19 vaccine for
children under 5 at UW Medical Center - Roosevelt in Seattle, Wash., on June 21,
2022. (David Ryder/Getty Images)
Vaccines & Safety


DATA FOR NEWLY AUTHORIZED COVID-19 BOOSTERS BASED ON MICE, NOT HUMANS

By Zachary Stieber
Zachary Stieber
Reporter
Zachary Stieber covers U.S. and world news. He is based in Maryland.
View profile
Follow
September 1, 2022 Updated: September 1, 2022
biggersmaller
Print
0:004:32

1



The preclinical data for the just-authorized COVID-19 booster shots are based on
just mice, not humans, because U.S. authorities believe waiting for human trial
data would have made the updated boosters outdated.

The data for Pfizer’s booster was based on just 8 mice, Pfizer scientists told
the U.S. Food and Drug Administration’s (FDA) vaccine advisory panel in June.
The data for Moderna’s booster was based on 16 to 20 mice, some of which
received the original booster, according to a presentation slated to be
delivered to the U.S. Centers for Disease Control and Prevention’s (CDC)
advisory panel on Sept. 1.

The mice data show “substantial increases against all Omicron sublineages
including BA.4/5 as well as the reference strain with the BA.4/5- modified
vaccines,” Kena Swanson, Pfizer’s vice president for vaccine research and
development, told the FDA panel.

BA.4 and BA.5 are both subvariants of the Omicron variant of the virus that
causes COVID-19.

Both Moderna and Pfizer developed boosters containing parts of the original
COVID-19 virus and the BA.1 subvariant, but the FDA after the June meeting asked
the vaccine makers to switch out the BA.1 component for a component targeting
BA.4 and BA.5, the latter of which is the dominant strain in the United States.

The FDA declined to require human trial data for authorization, and granted
authorization for both updated boosters on Aug. 31.

The mice data “demonstrate that these vaccines successfully evoke an immune
response in the same way previous versions of the vaccine have,” Dr. Peter
Marks, a top FDA vaccine official, told reporters on a call.

CDC Director Dr. Rochelle Walensky also signaled support for the path.

“If we wait for those data to emerge in human data, not just mice data, we will
be using what I would consider to be a potentially outdated vaccine,” Walensky
said on “Conversations on Health Care” during a segment broadcast on Aug. 29.


UNPRECEDENTED

Dr. Monica Gandhi, a professor of medicine at University of California, San
Francisco, said that she thinks the updated booster “has the potential to
increase antibodies in humans to the circulating subvariant (mainly BA.5 at this
point), but to be fair, we need to note that we only have data in mice of
increased antibodies at this point.”

“We do not have human data on this new booster, either antibody data or clinical
data. However, there is biological plausibility that these updated boosters will
curb cases by increasing antibodies as we enter the winter,” Gandhi told The
Epoch Times in an email.

Gandhi recommends all Americans 65 and older, or others who are
immunocompromised, get the updated booster, especially in those who received
their most recent shot more than 6 months ago, citing recent papers on vaccine
effectiveness.

The FDA is advising all Americans 12 and older to get the updated booster just
two months after their latest shot.

John Moore, a vaccine expert at Weill Cornell Medicine, told USA Today before
the authorizations that relying on mouse data “would be unprecedented in my
knowledge and would certainly raise eyebrows,” but told The Epoch Times in an
email on Thursday that he’s not concerned about safety.

“It’s still the same vaccine, just with a small tweak. The same strategy is used
every year to adjust the composition of the standard flu vaccines. I’d draw an
analogy to getting a new paint job on your car—that would not trigger the need
for a full-service check into all the safety features. However, I think many
members of the public may be concerned—particularly ones who have listened to
the lies from anti-vaxxers,” he added, using a pejorative for people concerned
about vaccine side effects and waning effectiveness.

Trial data is available for the boosters that contain BA.1. That data showed the
boosters worked better than the boosters that were being administered, which
targeted just the original virus variant.

That variant was displaced early in the pandemic. A series of variants have
since emerged. Omicron became dominant in the United States in late 2021. The
strain and its subvariants have proven better able to evade the protection
bestowed by vaccines, triggering the clearance and recommendation of boosters
and, now, the authorization of the updated boosters.

The CDC convened its advisory panel on Thursday to ask whether it should
recommend people get an updated booster, or merely say people may get an updated
booster.

Zachary Stieber
Reporter
Follow
Zachary Stieber covers U.S. and world news. He is based in Maryland.




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