Most of us think of polio as a disease consigned to the past, or isolated outbreaks in developing countries.
But now New York has a confirmed adult case of polio, along with virus fragments detected in sewage outside the nations largest city.
In London about 900,000 children in London are to be offered a booster dose of a polio vaccine after virus fragments were found in sewage, however, no active cases have been reported.
Worryingly, routine childhood immunisations dropped dramatically globally during the Covid-19 pandemic.
Immunisation coverage at six months of age has fallen in New Zealand from a high of around 80 percent in early 2020 to 67 percent by June 2022, and as low as 45 percent for Māori.
World Health Organistion spokesperson for polio eradication Oliver Rosenbauer spoke to Guyon Espiner.
