to me epidemiological update From the World Health Organization (WHO) and the Pan American Health Organization (PAHO) published December 30, 2022, the virus strain was found in two wastewater samples taken between August 20 and August 30, 2022.
The report shows that the swab sites selected for testing were in communities associated with New York State, but it does not provide an exact location. The report says there were no suspected or confirmed cases of acute flaccid paralysis, the most common syndrome caused by polio, in the areas where Canadian sewage samples were taken.
In August 2022, New York State reported Samples of the virus appear in wastewater after an unvaccinated patient was diagnosed with polio, marking the first time a case of polio has been reported in the United States after nearly a decade.
After cases emerged overseas last summer, the Public Health Agency of Canada (PHAC) said it would begin testing and monitoring wastewater for the virus. Canada has not reported a case of polio since 1994. The presence of VDPV2 was confirmed in the two samples taken in August on December 23, 2022.
Canada’s National Microbiology Laboratory, which collects swabs in Canada, did not find polio in wastewater samples taken between October 31 and November 9. However, the laboratory will continue to test archived samples taken from the target sites in September and December.
The report indicates that WHO/PAHO will work with the Primary Health Care Center to track these findings. CTVNews has also reached out to PHAC for comment, but has not yet received a response.
“WHO/PAHO reiterates to Member States the need to continue efforts to achieve optimal levels of population immunity through high and consistent vaccination coverage,” the report stated. “(f) Through sensitive epidemiological surveillance that enables timely detection and investigation of all cases of acute flaccid paralysis (AFP).”
Since September 2022, the United States has reported 94 sewage samples that tested positive for polio, 87 of which were linked to the confirmed case in Rockland County, New York, according to the report.
The World Health Organization and the US Centers for Disease Control and Prevention (CDC) say VDPV is a rare strain of poliovirus, genetically modified from the original, weakened strain in the oral polio vaccine.
“If the virus is allowed to circulate long enough in unvaccinated or unvaccinated populations, or if it replicates in an immunocompromised individual, the weakened virus can revert to the form that causes disease and paralysis.” CDC on its websitewhile emphasizing that OPV is safe and has “helped eradicate wild polioviruses worldwide”.