The inactivated version of the polio vaccine used in the US doesn't infect people.
The recent polio case in New York, occurred in an unvaccinated young adult. While the person is no longer contagious, they have become paralyzed. Health officials believe the patient contracted the disease after taking an oral version of the vaccine that uses the live virus. Since 2000, the US has been using anwith a dead virus that trains the immune system to recognize and destroy the pathogen.
However, some countries still use the live attenuated vaccine, which delivers a weak but viable polio virus to create a lasting immune response. With this treatment, there is a small risk of the virus mutating and infecting others. “It mimics natural infection, and people shed the virus, the vaccine virus, and that spreads to other people, and then they get immunized that way,” Amesh A.
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