In another indication that polio, which has not been observed in the United States in a decade - is slowly spreading among people without a vaccine, polio virus was found in New York City's wastewater, U.S. health officials said.

The presence of the virus in the city's wastewater is likely to indicate the spread of the virus locally, city and state health authorities said.

State Health Commissioner Dr. Mary T. The monitoring of the virus in sewage samples in New York City is alarming but not surprising.

D ' Ashauvin Vassan, New York City's health commissioner, said that "the risk to New Yorkers is real but the defense is very simple - get the polio vaccine."

"As polio spreads in our gatherings there, there is simply nothing more necessary than vaccinating our children to protect them from this virus, and if you have not had the vaccine or received it incomplete as adults, please now choose to have it. polio is completely preventable and its re-emergence must be a wake-up call for all of us ".