Vaccine-related polio virus found in sewage collected from Amberpet; the area being monitored and additional samples collected for testingState’s health arm has been put on alert after vaccine-related polio virus was found in sewage collected from Amberpet. The vaccine-derived viruses spread and infect humans similar to wild polio viruses, which were eradicated from the country years ago. The lab found Type-2 vaccine-derived polio virus. Bivalent oral vaccines do not contain Type-2 polio virus, the variant blamed for vaccine-derived polio infections in India. Oral Polio Vaccines use weakened but live viruses to induce immunity.

Source: The Hindu June 15, 2016 00:07 UTC