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Vaccine contamination with Simian vacuolating virus 40, known as SV40 occurred in the United States and other countries between 1955 and 1961.. SV40 is a monkey virus that has the potential to cause cancer in animals and humans, although this is considered very unlikely and there have been no known human cases. [1]
The risks and possible side effects of the polio vaccine are comparable to those of other vaccines, the CDC says, such as pain, soreness, swelling, and/or redness at the injection site. Fainting ...
The polio vaccines prevented 29 million cases of paralytic polio between 1960 and 2021, compared with a counterfactual world with no vaccines, according to researchers’ estimates.
As of 2019, nearly 93% of U.S. children had received three or more doses of the polio vaccine by age 2, according to the CDC. Vaccination rates in Rockland County and Orange County in New York are ...
Doses of oral polio vaccine are added to sugar cubes for use in a 1967 vaccination campaign in Bonn, West Germany. During the race to develop an oral polio vaccine, several large-scale human trials were undertaken. By 1958, the National Institutes of Health had determined that OPV produced using the Sabin strains was the safest. [43]
According to the U.S. Centers for Disease Control and Prevention, while "any vaccine can cause side effects", [11] most side effects are minor, primarily including sore arms or a mild fever. [11] Unlike most medical interventions vaccines are given to healthy people, where the risk of side effects is not as easily outweighed by the benefit of ...
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As with all medications, vaccines are continually monitored for safety, and like any medication, vaccines can cause side effects. The side effects of vaccination are typically minor and go away within a few days. There is a risk that the child could have a severe allergic reaction, but these reactions are rare.