![]() ![]() if travelers pick it up elsewhere and bring it back to the country. Vaccine-derived poliovirus can crop up in the U.S. Unvaccinated people exposed to this reinvigorated pathogen are susceptible to developing paralytic disease, which occurred in the Rockland case. As it does so, it can accumulate mutations and eventually emerge as a symptom-causing form known as vaccine-derived poliovirus. In regions around the world where the oral vaccine remains in use, the weakened virus can circulate beyond secondary immunization of immediate contacts and travel through unvaccinated or undervaccinated populations. The killed-virus vaccine protects against polio itself but not against viral transmission. switched to an injectable vaccine that uses a killed virus and does not carry this risk. In response, and because of wild polio’s eradication from the country, in 2000 the U.S. From 1980 to 1992, 109 cases of this vaccine-related polio occurred with the administration of 262 million doses of the oral vaccine in the U.S., for an average of about 8.4 cases annually. The upshot is amplification, meaning a single, easily administered vaccination can indirectly immunize many people against both infection and disease once immunity kicks in.īut in sporadic cases, the weakened virus has led to polio in vaccine recipients. It comes with an additional benefit: a person carrying the weakened virus can shed it for a few weeks, passing it to unvaccinated close contacts without causing symptoms-a form of secondary immunization. The oral vaccine is cost-effective, easy to administer, involves no needles and triggers an immune response that reduces risk for later infection and prevents disease. relied on an oral polio vaccine containing a weakened version of the virus. In the last few decades of the 20th century, the U.S. complicates polio eradication here and reflects the history of vaccination against the condition. The type of poliovirus now circulating in the U.S. To prevent the stealthy spread of polio in communities, New York Governor Kathy Hochul issued an emergency declaration this month that adds pharmacists, paramedics and midwives to the list of people the state authorizes to administer the vaccine. And many people infected with the virus never develop symptoms but can still pass the virus to others. In three of the affected counties, polio vaccination rates hover around 60 percent, leaving unvaccinated residents vulnerable. in almost a decade.īut public health workers subsequently detected genetic signs of the virus in wastewater samples in New York City-as well as in Rockland County and three other counties in the state-suggesting other people in the region may have been infected, too. ![]() A man in Rockland County, New York, is the sole person to have developed polio in the U.S. Centers for Disease Control and Prevention. polio vaccination rates have exceeded 90 percent in recent years, with most children receiving three doses by age two, as recommended by the U.S. could extinguish the outbreak and potentially restore the country to a poliovirus-free condition.Įxperts agree that a vaccinated population is the best defense against poliomyelitis, the technical name for the disease caused by the poliovirus-which can sometimes lead to permanent paralysis. ![]() Measures to address pockets of dangerously low polio vaccination rates around the U.S. has left the public wondering: Is polio back? The short answer is yes-but a high-profile New York State outbreak is related to unusual factors that don’t apply to the general population. A recent spate of polio-related news in the U.S. ![]()
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