A sign guides drivers to a vaccine clinic at the Rockland County health department, in Pomona, New York, on July 22. New York Health officials are offering pop-up polio vaccinations and urging the public to get the shots.
Mandatory Credit: Victor J. Blue/The New York Times/Redux
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'Silent' spread of polio in New York drives CDC to consider additional vaccinations for some people
A polio case identified in New York last month is "just the very, very tip of the iceberg" and an indication there "must be several hundred cases in the community circulating," a senior official with the US Centers for Disease Control and Prevention told CNN on Wednesday.
