An adverse allergic reaction to a covid vaccine is rare, but just how rare remains to be seen. On Wednesday, the National Institutes of Health announced a new study to try to understand the number of people experiencing moderate allergic reaction to mRNA vaccines, and why. Joanne Kenen — who had an allergic reaction to her first Pfizer dose — reports.
An adverse allergic reaction to a covid vaccine is rare, but just how rare remains to be seen. On Wednesday, the National Institutes of Health announced a new study to try to understand the number of people experiencing moderate allergic reaction to mRNA vaccines, and why. Joanne Kenen — who had an allergic reaction to her first Pfizer dose — reports.