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Number of circulating vaccine-derived poliovirus type 2 and type 3 cases, by month. Somalia, January 2017 to March 2024.

Data as of May 16, 2024. OPV campaigns were conducted as follows: three bOPV NIDs were conducted during 2017 (February, April, and December); three during 2018 (May, July, October, and November); two during 2019 (March and November); and three during 2020 (March, August, and December). Two mOPV2 NIDs were conducted during 2021 (June and July) and two in 2022 (March and June). Two nOPV2 NIDs were conducted during 2023 (August and November). One bOPV SNID was conducted during 2019 (April). One mOPV2 SNIDs was conducted during 2017 (December); four during 2018 (January, July, August, and September); four during 2019 (May, June, August, and September); two during 2020 (September and October); three in 2021 (February, March, and October); and three in 2022 (February, August, and October). One tOPV SNID was conducted during 2022 (November) and one in 2023 (February). Three nOPV2 SNIDs were conducted during 2023 (May, June, and July), and two during 2024 (February and March). Abbreviations: cVDPV2 = circulating vaccine-derived poliovirus type 2; cVDPV3 = circulating vaccine-derived poliovirus type 3; bOPV = bivalent oral poliovirus vaccine (OPV); mOPV2 = monovalent OPV type 2; NID = national immunization day; OPV = oral poliovirus vaccine; nOPV2 = novel OPV type 2; SNID = subnational immunization day; tOPV = trivalent OPV. (Public domain. Mendes A, Mohamed GA, Derow M, Stehling-Ariza T, Mohamed A, Mengistu K, et al. Persistent transmission of circulating vaccine-derived poliovirus. Somalia, January 2017 to March 2024. MMWR Morb Mortal Wkly Rep 2024;73[25]:575-80.)

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Associated Disorders

  • Aseptic meningitis
  • Bulbar polio
  • Bulbospinal polio
  • Infantile paralysis
  • Nonparalytic polio
  • Paralytic polio
  • Polioencephalitis
  • Post-polio progressive muscular atrophy
  • Post-polio syndrome
  • Spinal paralytic polio