the school in yarmouth that year had a low opt-out rate � 2 percent, the superintendent said � so there was a cap on the amount of disruption an illness could cause. .
but what if it had happened in one of the maine schools where the rate is 10 percent or more? .
not coincidentally, maine has a high rate of whooping cough cases � 21.1 per 100,000 people in 2015, compared to 10.3 per 100,000 nationwide. .
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