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Polio still a threat to public health
Date:11/7/2011

Health professionals and researchers across the globe believe they are on the verge of eradicating polio, a devastating virus which can lead to paralysis and death. Despite successful eradication in most countries, there are still four countries where the virus is considered endemic -- and many more in which the virus still lurks.

Dr. Lester Shulman of Tel Aviv University's Sackler Faculty of Medicine and the Israeli Ministry of Health has spent years tracking isolated cases of live poliovirus infections, often discovered in countries that are supposedly polio-free. When the live-virus version of the vaccine, called Oral Polio Vaccine (OPV) evolves, he says, it can act like wild poliovirus and continue the threat of contagion.

Medical professionals widely believe that after the wild virus is eradicated, resources dedicated to polio immunization can be redirected. But this isn't so, he says. He recommends that public health agencies take a three-pronged approach: Vaccination policies to maintain "herd immunity" (a 95 percent immunization rate for polio) should be maintained to prevent the spread of wild and evolved vaccine strains of the virus; environmental surveillance of sewage systems should continue; and a switch to Inactivated Polio Vaccine (IPV) instead of OPV should be implemented.

Dr. Shulman's research was recently published in PLoS ONE. He has also been invited as an informal expert to the World Health Organization's annual meeting on polio this fall.

A decade-long chase

While the eradication of polio is seemingly within reach, this is not the time to relax, Dr. Shulman warns. Most countries only investigate the possibility of poliovirus outbreaks when paralytic cases appear in the human population. But this doesn't take into account a potential problem posed by the live virus vaccine. Over time, the vaccine can mutate, and even a 1 percent genomic change in the virus permits the virus to b
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert

Page: 1 2 3

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