Scientists in Britain have detected multiple versions of the virus in wastewater. Officials say the risk to the public is extremely low and urge people to ensure their polio vaccines are up to date.
Countries in Africa, the Middle East and parts of Asia are counting more cases of vaccine-derived polio. One reason for this, say experts, is that vaccination efforts have lapsed during the pandemic.
The pandemic has slowed efforts to eradicate the contagious disease. Yet the country's polio effort offers insights on the launch of its coronavirus vaccine campaign.
In 1957, residents of the southwestern town Protection set an example by being the first in the U.S. to be fully inoculated against polio. Now locals are divided on the safety of COVID-19 vaccines.
It looked as if polio would be the second human disease to be eliminated — after smallpox. But "2020 has been a terrible year," the head of the Global Polio Eradication Initiative says.