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Most side effects are well documented and appear within 8 weeks. Many studies show vaccines do not cause disorders like autism, multiple sclerosis, or type 1 diabetes. COVID-19 vaccine may be newer, but mRNA vaccines are not. They are part of ongoing research for cancer, Zika, flu and rabies. The mRNA in the COVID-19 vaccine is gone from the body within 24 hours.

Rare cases of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the outer lining of the heart) have been reported after children and teens got COVID-19 vaccine. Although a serious issue, most myocarditis cases caused by vaccine resolve quickly with little medical intervention. Myocarditis is more common after getting a COVID-19 infection.