Childhood vaccines, with the exception of the vaccine for measles, mumps and rubella, were not linked to an increased risk of immune thrombocytopenic purpura among young children, a study found. However, the hepatitis A vaccine was associated with an increased ITP risk among 7- to 17-year-olds, while the chickenpox and Tdap vaccines were tied to the disorder among 11- to 17-year-olds, researchers reported in the journal Pediatrics.

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