Anti-Covid vaccine: the side effects of the 3rd dose are “similar” to the 2nd, according to a US study

Side effects seen after a booster dose of Pfizer and Moderna’s anti-Covid vaccines are largely “similar” to those experienced after the second, according to a study published Tuesday, September 28 by US health authorities. United.

These data were obtained from several thousand people who received a third dose of these remedies between mid-August and mid-September, when it was authorized for certain immunosuppressed people in the country. The study shows that “booster doses are currently well tolerated,” Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC), said at a news conference. “The frequency and type of side effects were similar to those seen after the second dose of the vaccine, and were mostly mild or moderate and of short duration,” he added.

SEE ALSO – Why It Is (Almost) Normal To Experience Side Effects After A Vaccine

More than 2 million Americans have received three doses

As of Sept. 19, more than two million people had already received a booster dose in the United States, according to the CDC. The data released Tuesday is based on about 20,000 people who signed up for an app and completed a questionnaire after their injections.

Among those who completed this questionnaire after each of the three doses, approximately 79% reported a localized reaction after the third injection (pain at the sting site, etc.), and 74% reported a so-called systemic reaction. that is to say, that is to say that it affects the whole body (fatigue …). After the second injection, these numbers were 78% and 77% respectively, so they were very similar.

Of the more than 20,000 people, about 28% said they were unable to perform their usual daily activities after the third dose, most of the time the day after the injection. These data are not representative of the American population, however, the CDC warns, most of the people registered on the app are white. In addition, the study does not necessarily focus only on immunosuppressed people, other people who may also have received a third dose by circumventing the recommendations in effect at the time, the CDC specifies.

US health officials, since late last week, have expanded the eligible population for a third dose of the Pfizer vaccine. Now it can also be received by people 65 years of age and over, and some at “risk” due to their health or due to a job that exposes them particularly to the virus.


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