Health officials on Thursday reported the detection of a case of vaccine-derived polio in a resident of Rockland County, New York, which is north of New York City.
The officials advised the medical community to be on alert for more cases.
According to the state health department, testing done at a state lab and confirmed by the CDC showed that the virus is a vaccine strain Sabin type 2, which indicates that transmission occurred from someone who received an oral polio vaccine.
Different from wild polio, which has been nearly eradicated globally, cases of vaccine-derived poliovirus occur when a