A type of poliovirus derived from vaccines has been detected in London sewage samples, the World Health Organization and British health officials said Wednesday, adding that more analysis was underway.
No human cases of polio have been found in Britain, where the crippling disease was fully eradicated two decades ago.
Cases have decreased by 99 percent since 1988, when polio was endemic in 125 countries and 350,000 cases were recorded worldwide., but a type of vaccine that contains small amounts of weakened but live polio still causes occasional outbreaks elsewhere.
"The most effective way to prevent further spread is to check vaccination histories, especially of young children, to check that polio vaccination is included," she said.The UN's health agency has called for OPV to be phased out worldwide and replaced with inactivated polio vaccine .
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