An unvaccinated young adult in New York recently contracted polio, which could be the first case in the United States in nearly a decadehealth officials announced on Thursday.
Authorities said the patient, who lives in Rockland County, developed paralysis. The person also developed symptoms a month ago and has not recently traveled outside the country, county health officials said.
It appears the patient had a vaccine-derived strain of the virus, perhaps from someone who received a live vaccine — available in other countries but not in the United States — and spread it, officials said.
The person is no longer considered contagious, but researchers are trying to find out how the infection occurred and if other people were exposed to the virus.