все может быть, у 3% вакцинированных бывает корь, но неизвестно когда и чем прививали вашего ребенка, и был ли иммунный ответ у него или нет:
Two doses of MMR vaccine are 97% effective at preventing measles, 1 dose is 93% effective. It is uncommon for someone fully vaccinated to develop measles. However, breakthrough infections (when someone becomes infected after they have been vaccinated) can occur, especially in communities experiencing an outbreak where high levels of measles virus are circulating. The number of breakthrough infections (approximately 5% of total) is consistent...
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