Polio virus has been found in New York City's wastewater.

This implies that, which until last month hadn't been seen in the US in a decade, is quietly spreading among unvaccinated people.

Authorities said that the presence of the polio virus in the city's wastewater suggested likely local circulation of the virus, health authorities from the city.

The authorities requested parents to get their children immediately vaccinated against the potentially deadly disease.

In this connection, New York City Health Commissioner Dr Ashwin Vasan said, "The risk to New Yorkers is real but the defence is so simple — get vaccinated against polio."

“Polio spreads silently, and it's likely that there are many people infected with polio and shedding the virus in these communities," said José Romero

There is no cure for polio, which can cause irreversible paralysis in some cases, but it can be prevented by a vaccine made available in 1955.

Polio is often asymptomatic and people can transmit the virus even when they do not appear sick.

However, it can produce mild, flu-like symptoms that can take as long as 30 days to appear.

It can strike at any age but the majority of those affected are children aged three and younger.

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