Delaying measles vax may boost immunity

Delaying the first childhood measles vaccination from 12 to 15 months of age could confer greater immunity later in life, research suggests.

A study of a 2011 Canadian high-school outbreak found the risk of contracting measles was 3-4 times higher in those who had been first vaccinated at 12 months, compared with 15 months.

In the study, almost 6% of children who had been first vaccinated at 12 months (and given a second dose at 18 months or 4-6 years of age

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