Polio viruses recently found in Jerusalem, New York and London were mutated versions of viruses that first originated in vaccines meant to stamp out the paralytic disease.
FILE - An Afghan health worker uses an oral polio vaccine on a child as part of a campaign to eliminate polio, on the outskirts of Kabul, Afghanistan, April 18, 2017. For years, global health officials have used billions of drops of an oral vaccine in a remarkably effective campaign aimed at wiping out polio in its last remaining strongholds typically, poor, politically unstable corners of the world.
The latest incidents represent the first time in several years that vaccine-connected polio virus has turned up in rich countries.in an unvaccinated 3-year-old, who suffered paralysis. Several other children, nearly all of them unvaccinated, were found to have the virus but no symptoms. The oral vaccine at issue has been used since 1988 because it is cheap, easy to administer — two drops are put directly into children's mouths — and better at protecting entire populations where polio is spreading. It contains a weakened form of the live virus.But it can also cause polio in about two to four children per 2 million doses.
Aidan O’Leary, director of WHO's polio department, described the discovery of polio spreading in London and New York as “a major surprise,” saying that officials have been focused on eradicating the disease in Afghanistan and Pakistan, where health workers have been killed for immunizing children and where conflict has made access to some areas impossible.
Last year, WHO and partners also began using a newer oral polio vaccine, which contains a live but weakened virus that scientists believe is less likely to mutate into a dangerous form. But supplies are limited.
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