What to know about polio and the first US case in nearly 10 years

EXPLAINER

Health authorities say the case may have originated outside of the United States.

The first case of polio in the United States in nearly 10 years has been identified in the state of New York in a young unvaccinated man.

The New York State Health Department said in a statement on Thursday the case in Rockland County may have originated outside of the US.

The person is no longer deemed contagious, but investigators are trying to figure out how the infection occurred and whether others…