“Two British people with severe allergies apparently had allergic reactions to
Pfizer/BioNTech's COVID-19 vaccine, raising questions about whether it is safe for people with preexisting allergies.
In response, British regulators advised those with severe allergies to avoid the vaccine.
It was not immediately clear what triggered the allergic reactions. Unlike some vaccines, in the Pfizer/BioNTech vaccine there are no preservatives or egg products, which have been known to trigger reactions with other types of vaccines.“
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“Slaoui said he assumes that the U.S. Food and Drug Administration committee meeting Thursday will discuss this issue and will suggest that people with severe allergies "should not take the vaccine until we know exactly what happened."
But a vaccine that triggers dangerous reactions in people with severe allergies poses a major challenge in the U.S., said Dr. Peter Hotez, a pediatrician and dean of the National School of Tropical Medicine at Baylor College of Medicine in Houston.
"If you start issuing recommendations that anyone with an EpiPen doesn't get vaccinated, that could be a showstopper for Americans," he said. About 3 to 4 million Americans carry epinephrine with them at all times in case of allergic reactions, Hotez noted, and 50 million have less severe allergies.
Hotez was confused by the allergic reaction, which was not predicted by trials in tens of thousands of people.“
[...]
“Dr. Paul Offit told CNN early Wednesday that severe allergic reactions to vaccines occur in about one of every 1.4 million shots. That's why people are asked to stay in a doctor's office for a few minutes after a vaccination, said Offit, an infectious disease specialist and director of the Vaccine Education Center at Children's Hospital of Philadelphia.
Rather than a "blanket recommendation" for people with allergies, "the smarter thing to do would be to try and look at these two patients and see what specific component of the vaccine they were allergic to," he said.“
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COVID vaccine allergic reaction: How Pfizer side effect may affect US