Anti-Vaccine Parents Found to Stick Together as Their Ranks Grow

January 19, 2015 6:53 AM

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More parents are leery about vaccinating their children, even against once-common diseases like measles and whooping cough. New research suggests their beliefs are contagious too.

A groundbreaking study of 154,424 children covered by Kaiser Permanente in Northern California found five geographic clusters where children were significantly more likely to be underimmunized by their third birthday, including almost 1 in 4 toddlers in part of Vallejo, a city in the San Francisco B...

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