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CDC: The side effects of the booster vaccines against corona are similar to the effect of the second dose


A new report from the Centers for Disease Control and Prevention (CDC) revealed that the side effects after booster doses of the Pfizer or Moderna vaccine are similar to the side effects of the second dose, that is, mild to moderate, according to the British Daily Mail website.


The researchers looked at reports submitted to v-safe - a voluntary smartphone-based safety monitoring system - after people received a third dose, and found that about 79% had reactions at the injection site, such as pain, redness or swelling, and 74% reported Other side effects such as fever, headache, chills, or joint pain.


The numbers are very similar with 77% of patients who reported injection site side effects and 76% who had other reactions after the second dose.


The CDC said the results show that there are no "unexpected patterns" that occur after the booster doses and that the third doses appear to be safe and well-tolerated.


The CDC looked at reports sent to the CDC's v-safe smartphone tool, between August 12 and September 19.


The tool uses text messages and web surveys so that people receiving the shots can report any symptoms or side effects they are experiencing.


During the study period, only immunocompromised Americans who received the Pfizer or Moderna vaccines were authorized to receive a booster dose.


Since then, third doses have been approved for adults 65 years of age or older, 18 to 64 years of age with comorbid conditions, and 18 to 64 years of age who are at high risk because of their occupation or where they live In it - but only the Pfizer vaccine.


Of the 2.21 million people who received a booster dose over the study period, there were 22,191 reports made for v-safe.


The report found that 1.8% - or 401 of the recipients - sought medical treatment and that only 13, or 0.1%, were hospitalized.


The reasons why people should seek medical care or need to be hospitalized were not included in the study.


Among the beneficiaries, 12,591 people reported using v-safe between zero and seven days after receiving their three doses.


The results showed that 79.4% of subjects reported injection site reactions after dose 3 compared to 77.6% after the second dose.


Additionally, 74.1% reported other side effects after the booster dose compared to 76.5% after the second dose.


Among adults who received three doses of Moderna, reactions such as itching, pain, swelling, and redness were more common after dose 3 of those doses at 84.7% compared to 83.5%.


However, so-called systemic reactions — including fatigue, headache, fever, muscle pain, joint pain, and nausea — were more common after the second dose.


A total of 81.3% of recipients reported these side effects after dose 2, compared to 79% after dose 3.


Similarly, among Pfizer recipients, 74.1% reported injection site side effects after the third dose compared with 71.7% after the second dose.


"The reports did not find any unexpected patterns of adverse reactions after a booster dose of the corona vaccine," the researchers wrote.


The CDC will continue to monitor the safety of vaccines, including vaccine boosters.

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