Feeling sick after a COVID vaccination is a good sign, study says

In this Jan. 22, 2021, photo, a certified medical assistant prepares doses of the Pfizer COVID-19 vaccine at a vaccination center at the University of Nevada, Las Vegas.
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In this Jan. November 2021, file photo, a board-certified medical assistant prepares doses of Pfizer's COVID-19 vaccine at a University of Nevada vaccination center in Las Vegas.

In this Jan. November 2021, file photo, a board-certified medical assistant prepares doses of Pfizer’s COVID-19 vaccine at a University of Nevada vaccination center in Las Vegas.


Don’t worry if you’re feeling sick after a COVID-19 vaccination — it’s actually a good sign, according to a new study.

Experience Symptoms after vaccination — including chills, fatigue, fever, headache, muscle aches, nausea and vomiting — means the body has a stronger immune response, a study published Oct. 11 shows. 21 found in the journal JAMA Network Open.

However, having few or no symptoms after a COVID-19 vaccination does not mean that the vaccine has not worked, according to the study.

Here’s what you should know.

Of 928 older adults who received two doses of either Pfizer’s or Moderna’s mRNA vaccine, those who reported symptoms after vaccination had a stronger antibody response compared to participants who reported only local symptoms, i.e. pain or a rash the injection site, or no symptoms at all, the study found. The average age of the participants was 65 years.

Because mRNA vaccines boost the body’s immune response, this causes antibodies to be produced, which helps protect against contracting COVID-19according to the Centers for Disease Control and Prevention.

“Taken together, these results support the reinterpretation of post-vaccination symptoms as signals of vaccine efficacy and reinforce guidelines for booster vaccinations in older adults,” the study authors wrote.

Dr. William Schaffner, an infectious disease specialist and medical director of the National Foundation for Infectious Diseases who was not involved with the research, told CNN that the study’s results “can give people who have had a reaction peace of mind that their immune system is working.” actually responding to that a pretty good way to vaccine, even if it made them a little uncomfortable.”

For those study participants who had no symptoms or pain and rash at the site of the COVID-19 vaccine, they still had “a positive antibody response” after receiving the Pfizer or Moderna vaccines, according to the study.

“I don’t want a patient saying to me, ‘Gosh, I didn’t get a reaction, my arm wasn’t sore, I didn’t have a fever. The vaccine didn’t work.’ I don’t want that conclusion to be made public,” Schaffner told CNN.

The lack of side effects after vaccination is okay, since the body is calmBuild protection against the virus,” according to CDC.

Dr. Ashley Lipps, an infectious disease specialist at Ohio State University’s Wexner Medical Center, wrote in an article published in May 2021: “It’s not entirely clear why some people experience side effects and others don’t.”

“It’s probably related to variations in the immune system and how it responds, which can be affected by things like age, genetics, or underlying medical conditions,” Lipps added.

The new study found that post-vaccination symptoms were more likely to be associated with younger participants, women previously infected with COVID-19, and the modern vaccine.

How long do the side effects of the COVID vaccine last?

Typically, the side effects of COVID-19 vaccines last a few days, according to the CDC.

however, if Lymph nodes swellIt could take about 10 days, according to Yale New Haven Health.

Serious side effects after receiving a COVID-19 vaccine are considered rare and can occur within six weeks, the agency said. Includes a serious side effect myocarditis and pericarditisan inflammation of the heart.

As for COVID-19 booster shots, responses have been reported to be similar after receiving a dose or two of the vaccine, according to the CDC.

This story was originally published Oct 27, 2022 4:23 p.m.

Julia Marnin is a McClatchy National Real-Time reporter covering the Southeast and Northeast while based in New York. She is a graduate of the College of New Jersey and joined McClatchy in 2021. She has previously written for Newsweek, Modern Luxury, Gannett and others.

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