The earlier administered oral polio vaccine contained P1, P2 and P3 strains, but with the P2 strain of the virus not surfacing in a long time, the vaccines too did not contain the P2 strain. As part of the special campaign, children aged between six weeks to three years will be given additional doses of the injectable polio vaccine (IPV). "The government has decided to conduct a special campaign against polio in Hyderabad and parts of Ranga Reddy from June 20 to June 26," said Rajeshwar Tiwari, prinicipal secretary, health. HYDERABAD: The Telangana government on Tuesday sounded a "global emergency" after an active strain of wild polio virus (P2 strain) was detected in a water sample collected from a drain, prompting it to airlift two lakh vaccines from Geneva to innoculate more than three lakh children in Hyderabad and Ranga Reddy district as a "preventive measure" from Wednesday.Vaccine Derived Polio Virus (VDPV) strain has not been seen in the country for more than five years. "In this case, the P2 strain is vaccine derived.

Source: Times of India June 14, 2016 22:58 UTC