Poliovirus has now been detected in sewage samples from four counties in the New York metro area as well as in the city itself. The counties are Rockland, Orange, Sullivan, and the latest, Nassau.
The samples tested positive for poliovirus that can cause paralysis in humans, according to state health officials. Unvaccinated individuals who live, work, go to school or visit Orange, Rockland, Nassau, New York City and Sullivan are at the highest risk of paralytic disease, officials said.
New York began wastewater surveillance after an unvaccinated adult caught polio in Rockland County in July and suffered from paralysis, the first known infection in the U.S. in nearly a decade.
The emergency declaration will expand the network of vaccine administrators to include pharmacists, midwives and EMS workers in an effort to boost the immunization rate in areas where it has slipped.
New York Health Commissioner Dr. Mary Bassett called on people who are unvaccinated to get their shots immediately. Individuals and families who are unsure of their vaccination status should contact a health care provider, clinic or the county health department to make sure they are up to date on their shots.
“On polio, we simply cannot roll the dice,” Bassett said. “I urge New Yorkers to not accept any risk at all. Polio immunization is safe and effective — protecting nearly all people against disease who receive the recommended doses.”
The polio vaccination rate is alarmingly low in some New York counties. The vaccination rate is 60% in Rockland, 58% in Orange, 62% in Sullivan and 79% in Nassau, according to the health department. The statewide average for polio immunization is about 79%.
The goal of the vaccination campaign is to boost immunization rates well above 90% statewide, according to the health department.
Some New Yorkers who completed their vaccine series should receive a single lifetime booster shot, health officials said. These individuals include people who might have contact with someone infected or thought to be infected with poliovirus or members of the infected person’s household.
Health care workers should also get a booster if they work in areas where poliovirus has been detected and they might handle specimens or treat patients who may have polio. People who might be exposed to wastewater due to their job should also consider getting a booster, health officials said.
All children should receive four doses of the polio vaccine. The first dose is administered between 6 weeks and 2 months of age, the second dose is given at 4 months, the third at 6 months to 18 months, and the fourth dose at 4 to 6 years old.
Adults who have only received one or two doses should get the remaining one or two. Health officials said it doesn’t matter how long ago the first doses were given.
Polio spreads between people when the virus enters the mouth, typically through hands contaminated with the stool of an infected person. The virus often spreads unnoticed because 70% of people infected do not show symptoms. About 25% of those infected develop mild symptoms similar to the flu.
One in 100 people infected develop severe disease such as permanent paralysis. Polio is fatal in 2% to 10% of people suffering from paralysis because the muscles used to breathe are immobilized.
The chain of transmission that introduced polio to New York is thought to have originated from abroad in someone who received the oral polio vaccine. The oral vaccine uses a weakened form of the virus that still replicates. In rare cases, the virus used in the vaccine can mutate, become virulent and spread to others.
The U.S. stopped using the oral vaccine more than two decades ago. It now uses a vaccine administered as a shot in which the virus is inactivated, which means it does not replicate and mutate. While this vaccine is very effective at preventing disease, it does not block transmission of the virus.
The oral polio vaccine can block transmission of poliovirus that occurs in nature, but carries the risk that the strain used in the vaccine could mutate to become virulent and result in spread of what’s called vaccine-derived poliovirus.
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