In this photo by Mahesh Kumar A., a child reacts in pain as she is given a shot of polio vaccine in Hyderabad, India. The city of nearly 7 million people started a vaccination campaign after an active strain of the virus was found recently in samples of sewage water. About 350,000 children aged 6 weeks to 3 years old will be vaccinated this week in Hyderabad and the neighboring Ranga Reddy district in the state of Telangana. The Health Ministry said the discovery did not reflect a resurgence of the crippling disease after India was declared polio-free in 2014. Rather it said the virus's existence showed the robustness of the random testing program done since the disease was eradicated.