The study is an interventional, non-randomized assessment of safety and efficacy of live Measles, Mumps and Rubella (MMR) vaccine in subjects aged 12-months to 17 years who have undergone heart transplantation. Subjects who provide permission/assent will receive the commercial MMR vaccine according to product indication and labeling.
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Number of participants who experience adverse reactions to the measles, mumps, and rubella vaccination
Timeframe: Between 0-240 days after vaccine administration
Number of participants with resultant initial seropositivity against measles after vaccination
Timeframe: Between 60-240 days after vaccine administration.