Vaccine Rollout Hits First U.S. Snags With Delays, Allergic Case

The first known allergic reaction to the Pfizer Inc. Covid-19 vaccine in the U.S. was reported in Alaska as some snarls began to emerge in the effort to send the shots across the country, highlighting the daunting challenges ahead for a historic immunization drive.

A health-care worker in Juneau, Alaska, with no history of allergies experienced flushing and shortness of breath 10 minutes after receiving a shot, the state health department said in a statement Wednesday.

The person was admitted to the emergency room and was given Pepcid, Benadryl and epinephrine through an intravenous drip. The patient stayed overnight and ...