Data indicates Pfizer’s new COVID-19 vaccine could cause a type of stroke in elderly people, two U.S. health agencies said on Jan. 13.
The threshold for a safety signal was met for Pfizer’s bivalent booster in the Vaccine Safety Datalink, a monitoring system run by the U.S. Centers for Disease Control and Prevention (CDC).
The signal was for ischemic stroke, a type of stroke caused by blood clotting.
The signal was triggered for people aged 65 and older, the CDC and the U.S. Food and Drug Administration (FDA) said in a joint statement.
Safety signals are triggered when an adverse event such as stroke happens at a certain rate following vaccination….