On June 17, 2016, the International Business Times  (IBT) reported that a strain of the vaccine-derived polio virus has been discovered in Hyderabad, India, and experts have warned that the likelihood of more cases being discovered over the next year is extremely likely.
Reporters stated that:
Experts also said that India’s current immunisation programme, which involves the use of Oral Polio vaccine (OPV), may also pose the risk of the spread of the disease.
OPV has a weak or attentuated virus that triggers immune response in children to fight against polio. However, in rare cases when a child excretes the virus, it may multiply in sewage, and undergo mutations which lead to transmission of the disease.