Federal officials are now stepping up to monitor and potentially fight the spread of polio.
It's a disease that spreads from person to person and can cause paralysis and death in people who are not vaccinated against it.
"We need about 80% of individuals to be vaccinated for herd immunity. And while we have that across the entire population, there are areas where it's less than 80% and those groups are at risk," Dr. Murray explains.
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