What is a vaccine-derived polio virus and why is it a threat?
In a vaccine-derived polio virus (VDPV), the source of the virus is the vaccine itself. Here are five things to know about VDPV and the concerns around it
Hyderabad: The Telangana government on Tuesday called for a special polio immunisation drive in Hyderabad, as part of preventive action after a surveillance study conducted by the World Health Organisation (WHO) found traces of vaccine-derived polio virus in the city’s Amberpet nala, a major sewage canal in the city.
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