First-Known Allergic Reaction to Pfizer Vaccine Reported in Alaska

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 is in stable condition, according to the Alaska health department.

The episode follows reports of a handful of similar reactions in the U.K., where health officials advised that anyone with a history of severe allergies shouldn’t take the Pfizer vaccine. U.S. regulators recommended last week that people should be monitored for allergy symptoms for 15 minutes after getting the shot, which gained an emergency-use authorization from the Food and Drug Administration on Friday.

Pfizer is coordinating with local officials, will closely monitor all reports suggesting serious allergic reactions and will update labeling language if needed, spokeswoman Jerica Pitts said in a statement.

The incident came to light as the first hiccups in the distribution of the vaccine in the U.S. emerged on Wednesday, including a holdup in delivering 3,900 shots to two states and the announcement that Pfizer would deliver about 900,000 fewer doses next week than are set to ship this week.

The authorization of Pfizer’s shot kicked off a massive mobilization effort. Vaccines are being sent from two company production facilities in the Midwest to all 50 states, the first wave in what is expected to be a months-long campaign to inoculate as many people as possible and bring an end to a pandemic that has killed more than 300,000 in the U.S. A similar shot made by Moderna Inc. is expected to gain U.S. clearance in coming days.

One challenge in moving and storing Pfizer’s shot, which it developed with the German drug maker BioNTech SE, has been that it must be kept at ultracold temperatures in specialized freezers and containers. Four delivery trays of the shot were pulled back from delivery to California and Alabama this week and sent back to the company because they were colder than anticipated, according to Gustave Perna, the army general who serves as Operation Warp Speed’s chief operations officer.

Each of the trays can likely be used to vaccinate 975 people. Pfizer has said its formula needs to be stored at 70 degrees below zero Celsius, the equivalent of minus 94 degrees Fahrenheit. These trays were found to be much colder, according to Perna.

“We were taking no chances,” he said during a Wednesday news briefing. Pfizer and federal health agencies are working to determine whether the formula can still be used when it reaches such low temperatures, according to Perna.

Pfizer deploys the doses in temperature-controlled shipping containers that its own engineers developed. The containers are each equipped with GPS trackers “for continuous, real-time location and temperature monitoring,” according to the company, which has an around-the-clock control tower monitoring every shipment.

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