A Kaiser Permanente study in Pediatrics found that toddlers who were given the combination measles, mumps, rubella and chickenpox vaccine were at greater risk of having a febrile seizure -- which are not linked to lasting harm -- a week to 10 days after vaccination than those who got the MMR and the chickenpox vaccines separately. "Unless parents have a strong preference for the combination vaccine, providers should use a separate vaccine," the lead author said.

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