FILE - A member of the Philadelphia Fire Department prepares a dose of the Johnson & Johnson COVID-19 vaccine at a vaccination site setup in Philadelphia, on March 26, 2021. On Friday, April 29, The Associated Press reported on stories circulating online incorrectly claiming a recent outbreak of unexplained hepatitis cases among children is being caused by the adenovirus vector used in some COVID-19 vaccines, including the Johnson & Johnson shot.(AP Photo/Matt Rourke, File)
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