Polio virus detected in environmental samples of Karachi, Quetta

Polio virus has been detected in environmental samples of Karachi and Quetta, media citing National Institute of Health (NIH) sources. According to the details, the same cross-border virus was found in two polio-positive cases earlier this year in Chaman and Dera Bugti. The polio has so far been found in sewerage and environmental samples of 31 districts of the country.