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Fever, headache, fatigue are all signs the vaccine is working, doctors say
TAMPA, Fla. - All three of the COVID-19 vaccines available are safe and effective, according to the medical and scientific community. However, they can cause mild to moderate side effects for some people, usually more severe after the second shot. There is really no way to tell for sure how your body will react to a COVID-19 shot, but doctors say those symptoms of fatigue, fever, or headache are actually a good thing."If you typically don’t have a bad reaction to vaccines, I wouldn’t expect anything different from these vaccines," said University of South Florida virologist, Dr.