About a third of Pa. counties below 95% measles vaccination rate
State health records track measles vaccination at kindergarten, 7th and 12th grade; roughly one-third of counties fall short of the 95% level needed for herd immunity.
About a third of Pennsylvania counties fall below the 95% measles vaccination rate needed to maintain ‘herd immunity’ among school-age children, according to data shared by the Pennsylvania Department of Health.