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WASHINGTON — A health care worker in Alaska had a serious allergic reaction after getting Pfizer’s coronavirus vaccine Tuesday, symptoms that emerged within minutes and required an overnight hospital stay.The middle-aged worker had no history of allergies but had an anaphylactic reaction that began 10 minutes after receiving the vaccine at Bartlett Regional Hospital in Juneau, Alaska, a hospital official said. She experienced a rash over her face and torso, shortness of breath and an elevated heart rate.Dr. Lindy Jones, the hospital’s emergency department medical director, said the worker was first given a shot of epinephrine, a standard treatment for severe allergic reactions. Her symptoms subsided but then reemerged, and she was treated with steroids and an epinephrine drip.Sign up for The Morning newsletter from the New York TimesWhen doctors tried to stop the drip, her symptoms reemerged yet again, so the woman was moved to the intensive care unit, observed throughout the night, then weaned off the drip early Wednesday morning, Jones said. He said the woman felt well, remained enthusiastic about the vaccine and was set to be discharged later Wednesday.Although the Pfizer vaccine was shown to be safe and about 95% effective in a clinical trial involving 44,000 participants, the Alaska case will likely intensify concerns about possible side effects. Experts described the woman’s symptoms as potentially life-threatening and said that they may prompt calls for tighter guidelines to ensure that recipients are carefully monitored for adverse reactions.Dr. Paul Offit, a vaccine expert and member of an outside advisory panel that recommended the Food and Drug Administration authorize the Pfizer vaccine for emergency use, said the appropriate precautions are already in place. For instance, he said, the requirement that recipients remain in place for 15 minutes after getting the vaccine helped ensure the woman was quickly treated.“I don’t think this means we should pause” vaccine distribution, he said. “Not at all.” But he said researchers need to figure out “what component of the vaccine is causing this reaction.”Dr. Jay Butler, a top infectious disease expert with the Centers for Disease Control, said the Alaska case showed the monitoring system works. The agency has recommended that the vaccine be administered in settings that have supplies, including oxygen and epinephrine, to manage anaphylactic reactions.Millions of Americans are in line to be inoculated with the Pfizer vaccine by the end of the year. As of Wednesday night, it was unclear how many Americans have received it. Alex Azar, the health and human services secretary, said that his department will be releasing that data “several days or maybe a week into this.”The Alaska woman’s reaction was believed to be similar to the anaphylactic reactions two health workers in Britain experienced after receiving the Pfizer-BioNTech vaccine last week. Like her, both recovered.Those cases are expected to come up Thursday, when FDA scientists are scheduled to meet with the agency’s outside panel of experts to decide whether to recommend that regulators approve Moderna’s COVID-19 vaccine for emergency use.Although Moderna and Pfizer-BioNTech vaccines are both based on the same type of technology and are similar in their ingredients, it is not clear whether an allergic reaction to one would occur with the other. Both consist of genetic material called mRNA encased in a bubble of oily molecules called lipids, although they use different combinations of lipids.Offit said in both vaccines, the bubbles are coated with a stabilizing molecule called polyethylene glycol that he considers a “leading contender” for triggering an allergic reaction. He stressed that more investigation is needed.Pfizer’s trial did not find any serious adverse events caused by the vaccine, although many participants did experience aches, fevers and other side effects. The Alaska woman’s reaction was assumed to be related to the vaccine because it occurred so quickly after the shot.A Pfizer spokesperson, Jerica Pitts, said that the company does not yet have all the details of the case but is working with local health authorities. The vaccine comes with information warning that medical treatment should be available in case of a rare anaphylactic event, she said. “We will closely monitor all reports suggestive of serious allergic reactions following vaccination and update labeling language if needed,” Pitts said.After the workers in Britain fell ill, authorities there initially warned against giving the vaccines to anyone with a history of severe allergic reactions. They later clarified their concerns, changing the wording from “severe allergic reactions” to specify that the vaccine should not be given to anyone who has ever had an anaphylactic reaction to a food, medicine or vaccine. That type of reaction to a vaccine is “very rare,” they said.

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