The deadly poliovirus may have been circulating in New York city since April and elsewhere in the state for up to one year, suggests a new analysis of wastewater sample from there.
The study from the US Centers for Disease Control and Prevention (CDC) published on Tuesday sheds more light on the polio case detected in an unvaccinated person in New York last month even as the virus was known to be eliminated from the US around 40 years ago.
