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

This 1964 microscope image made available by the US Centers for Disease Control and Prevention shows damage from the polio virus to human spinal cord tissue [File: AP]

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.