Status: affected by circulating vaccine-derived poliovirus type 2 (cVDPV2)

Polio this week in Canada

  • No circulating vaccine-derived poliovirus type 2 (cVDPV2) was reported in the past week. Previously, cVDPV2 was isolated from two environmental samples from a large wastewater treatment plant and a target site in the city of Montreal, Quebec, collected on 27 and 30 August 2022, after the country conducted retrospective analysis of wastewater samples. Genetic sequencing confirmed it is linked to the cVDPV2 currently affecting New York, USA.

International Health Regulations

Countries affected by poliovirus circulation are subject to temporary recommendations issued by the Emergency Committee of the International Health Regulations on Poliovirus, under the auspices of the Public Health Emergency of International Concern.  The latest report by the Committee is as of  November 2022.

Travel advice

WHO’s International Travel and Health recommends that all travellers to polio-affected areas be fully vaccinated against polio. Residents (and visitors for more than 4 weeks) from infected areas should receive an additional dose of OPV or inactivated polio vaccine (IPV) within 4 weeks to 12 months of travel.