Young people and adults aged 15 and over who missed out on MMR vaccine when they were younger and some under-vaccinated communities have been particularly affected.
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IOW the illegal aliens moslems from the Middle East...
also my generation who had measles when we were children are immuned too...
As you point out: Euro travelers who catch from un-vaccinated illegal/illiterate/un-imunized refugees INTO Europe from the Muslim states. Euro “humanist” parents who did not immunize their kids because of false health concerns and bad/propagandized education indoctrination