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Polio case confirmed in New York state, health-care suppliers instructed to search for extra

Polio virus, illustration. Each virus particle is composed of a protein coat around a core containing RNA genetic material. This virus infects children and causes the disease poliomyelitis or infantile paralysis.

Roger Harris/science Photo Library | Science Photo Library | Getty Images

The New York State Health Department on Thursday confirmed a case of polio and asked health-care providers to look for additional infections.

A resident of Rockland County, less than an hour outside New York City, tested positive for polio, according to the state health department. The Centers for Disease Control and Prevention confirmed the infection.

Health authorities in New York believe the case originated outside the U.S. No cases of polio have originated in the U.S. since 1979, according to the CDC.

The polio strain the individual caught, known as revertant Sabin type 2 virus, suggested the chain of infection began with someone who received the oral polio vaccine, according to the state health department. The oral polio vaccine contains a mild virus strain that is still able to replicate, which means people who receive it can spread the virus to others.

The oral polio vaccine is no longer administered in the U.S., which suggests the chain of transmission began abroad, according to New York health officials. The U.S. uses an inactivated polio vaccine that is administered as a shot in the leg or arm. This vaccine uses a non-replicating virus strain so people who receive it cannot spread the virus to others.

The CDC recommends that all children receive the polio vaccine. New York state requires that all children receive the shot before they start school.

Polio is highly contagious and often begins with symptoms similar to the flu such as fatigue, fever, headache, muscle pain, vomiting and stiffness. Symptoms can take as long as 30 days to develop, which means people who haven’t fallen ill yet can still spread the virus to others.

In rare cases, polio can cause paralysis and death. The virus caused widespread fear in the 1940s before vaccines were available, with more than 35,000 people becoming disabled from polio every year, according to the CDC. At the time, many parents were afraid to let their children play outside during the summer when transmission peaked.

However, a successful national vaccination campaign in the 1950s through the 1960s dramatically reduced the number infections. The U.S. became polio free by 1979.

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