The proportion of chickenpox infections in Antelope Valley, Calif., and West Philadelphia, Pa., substantially dropped in all age groups between 2006 and 2010, following the introduction of the two-dose varicella vaccination program, a CDC study in the journal Pediatrics showed. Of the people who got chickenpox in both cities during the study period, 62% received a single dose of the vaccine, while 7.5% got a second dose.

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