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Infectious Disease
Surveillance report describes circulating vaccine-derived poliovirus outbreaks from 2021 to 2022
Global health report describes polio outbreaks linked to oral vaccine strains
A worldwide surveillance report described outbreaks of circulating vaccine-derived polioviruses (cVDPVs) from January 2021 through December …
A global health report tracks rare polio outbreaks caused by weakened vaccine viruses spreading in under-immunized communities between 2021 …
CDC
Apr 5, 2026
Infectious Disease
Vaccine-derived poliovirus cases reported in 39 countries during surveillance period
Where is polio still spreading? Cases reported in 39 countries.
A worldwide surveillance report covering January 2023 to June 2024 documented cases of vaccine-derived polioviruses in 39 countries. No spec…
Polio cases appeared in 39 countries between January 2023 and June 2024, showing the virus still circulates where vaccination rates are low.
CDC
Apr 5, 2026