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After the vaccine: sore arm, yes. Headache, maybe. Regrets, no.

Both Pfizer-BioNTech and Moderna vaccines are based on genetic technology that has never previously produced a vaccine that has gained regulatory approval. They are authorized for emergency use only. Studies on their safety, including cases of an Alaskan health worker and a doctor in Boston who had severe allergic reactions after receiving their injections, are still ongoing.

And as Dr Wilson got into bed at 10:30 a.m. on a weekday morning, she couldn’t help but be “hyper-aware,” she said, “that I had just been vaccinated with it. this new vaccine.

As the vaccines wane, experts agreed, the two being handed out are now eliciting more reactions than most.

At Sundale Nursing Home in Morgantown, W.Va., Betty Shannon, 81, said some of her compatriots had stomachaches after becoming one of the first elderly in the country to receive a Covid vaccine.

Lorenzo Alfonso, 34, an assistant nurse in California, was unusually tired and sore.

Delayna Frint, a nurse in Highlands Ranch, Colorado, said her arm was so sore after the shot that to hang up the IV therapy bags she had to lower the brackets.

But for infectious disease experts, a lagging nation with post-vaccine discomfort would be the best news for a long time. The side effects wear off within days, and they are a signal, experts say, that the vaccine is working.

“We call them ‘side effects’, but it’s really just one effect,” said Dr. Paul Offit, a vaccine specialist from the University of Pennsylvania who is a member of the Food and Drug Administration’s vaccine advisory committee. . “That’s what your immune response does when it responds to an infection.”

The vaccines each work by causing the body to make a particular protein that the coronavirus uses to enter human cells; neither exposes the recipient to the virus itself. The presence of this protein in the body triggers the production of new antibodies that can destroy the protein – the key to providing protection against future invasion of the actual virus. But the process also releases substances that can cause inflammation, which can lead to fever, fatigue, headaches, and other symptoms.

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