The vast majority of side effects from Pfizer and Moderna Covid vaccines are mild and subside within a day or two, according to a CDC study
in themedical journal, bolstering evidence about the safety of mRNA vaccines using the same data frequently misused by anti-vaccine advocates.Safety data from federal databases managed by the CDCand the Food and Drug Administration suggests that 92% of self-reported side effects from Pfizer-BioNTech and Moderna Covid-19 vaccines were mild and faded within a day or two, according to the peer reviewed study.
Less than 1% of the people self-reporting side effects reported seeking medical care after vaccination, the researchers found, and the most common side effects reported were fatigue, headache, injection sight pain and chills. Though nearly 4,500 deaths were reported after vaccination during the study’s six-month time period between December 2020 and June 2021—covering the first months of the U.S. vaccination campaign when nearly 300 million doses were administered—the researchers said there was no evidence linking the vaccines to the deaths.
More than 80% of the deaths reported after vaccination—a requirement for healthcare providers on account of the shots’ emergency authorization—were among people ages 60 and over, a group that “already has a higher baseline mortality rate than the general population” and the pattern after Covid vaccines “follow similar patterns of deaths rates…following other adult vaccinations,” explained study author Dr. David Shay, of the CDC.
The CDC’s Dr. Hannah Rosenblum, one of the study’s authors, said the findings from the “most robust” vaccine monitoring systems in U.S. history “should bolster confidence that mRNA Covid-19 vaccines are safe.”The findings add to an already substantial body of evidence supporting the safety of the mRNA Covid-19 vaccines in widespread use, especially when considering the risks of actually contracting Covid-19.
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