A U.S. Food and Drug Administration staff recommends monitoring people who get Pfizer or Moderna's Covid-19 vaccine shots for possible cases of Bell's palsy.
It's not necessarily a side effect but worth watching out for after a handful of trial participants got the condition, which causes half of your face to droop.
A 54-page staff report released said there were four reported cases of Bell's palsy among Moderna's more than 30,000 clinical trial participants. Three of the participants who got Bell's palsy also received the vaccine instead of a placebo shot.
Pfizer's trial similarly had four reported cases of Bell's palsy out of some 43,000 participants. All four Bell's palsy cases in Pfizer's trial got the vaccine and not the placebo.
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