Community protection against measles jeopardized

‘Herd immunity’ in 17 states threatened by low vaccination rates

Disneyland crowd

PROTECTING THE HERD  The measles outbreak traced to Disneyland emphasizes the importance of herd immunity: When a large fraction of a population is vaccinated against a disease, those who haven't been vaccinated experience some protection.

 chris.alcoran/Flickr (CC BY-NC-ND 2.0)

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