Preliminary CDC data indicated a possible stroke risk following simultaneous administration of the Pfizer Covid booster and the flu vaccine.
The CDC said one of its monitoring systems detected a preliminary safety signal for stroke in people ages 65 and older who received the Pfizer omicron booster.
Nearly 161,000 nursing home residents have died from Covid since 2020.
Pfizer said the booster triggered more antibodies against omicron BQ.1.1, BA.4.6, BA.2.75.2 and XBB.1 in adults older than 55 compared to the original vaccines.
Moderna found that the new booster triggered five times more antibodies against omicron BA.5 than the old vaccines in people with prior Covid infections.
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