Two African countries reported more circulating vaccine-derived poliovirus type 2 cases.
Five European countries have now detected poliovirus in wastewater over the past few months.
The WHO said the increasing XEC COVID-19 variant isn't likely to burden healthcare systems as much as earlier variants.
The European region has been free of polio since 2002.
Nigeria reported a single case of cVDPV2 in September and now has 81 cases for the year.
The current vaccination rate in 3-year-olds is 86%, below the 95% level needed to prevent the spread of the virus.
A WHO official this week said repatriation is one of multiple factors fueling rises in Pakistan and Afghanistan.
As a steady polio rise continues in Pakistan, the country has now reported 45 cases this year.
PAHO says it will provide countries in the Americas with affordable access to respiratory syncytial virus vaccine.
Afghanistan and Pakistan reported more WPV1 cases, as 3 African countries report more vaccine-derived cases.
