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 live but weakened strain of virus that is included in vaccines spreads between people. Like wild polio, vaccine-derived poliovirus can cause paralysis. According to the state health department, it is the first case of vaccine-derived polio recorded in the United States since...
