Update on vaccine-derived poliovirus outbreaks--worldwide, January 2023-June 2024/Le point sur les flambees epidemiques de poliovirus derives d'une souche vaccinale dans le monde, janvier 2023-juin 2024

Circulating vaccine-derived polioviruses (cVDPVs) can emerge and lead to outbreaks of paralytic polio as well as asymptomatic transmission in communities with a high percentage of under-vaccinated children. Data from the WHO Polio Information System (POLIS) and the Global Polio Laboratory Network (G...

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Published inWeekly epidemiological record Vol. 99; no. 42; pp. 596 - 608
Main Authors Namageyo-Funa, Apophia, Greene, Sharon A, Henderson, Elizabeth, Traore, Mohamed A, Shaukat, Shahzad, Bigouette, John Paul, Jorba, Jaume, Wiesen, Eric, Bolu, Omotayo, Diop, Ousmane M, Burns, Cara C, Wassilak, Steven G.F
Format Journal Article
LanguageEnglish
Published World Health Organization 18.10.2024
Subjects
Vaccination
Vaccines
Nigeria
Madagascar
Mozambique
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Summary:Circulating vaccine-derived polioviruses (cVDPVs) can emerge and lead to outbreaks of paralytic polio as well as asymptomatic transmission in communities with a high percentage of under-vaccinated children. Data from the WHO Polio Information System (POLIS) and the Global Polio Laboratory Network (GPLN) are used below to describe global polio outbreaks due to cVDPVs during January 2023-June 2024. This updates previous reports. During the reporting period, 74 cVDPV outbreaks were detected in 39 countries, predominantly in Africa. Of the outbreaks, 47 (64%) were new and were detected in 30 (77%) of the 39 countries. Three countries reported cVDPV type 1 (cVDPV1) outbreaks; 39 reported cVDPV type 2 (cVDPV2) outbreaks; and 2 countries reported co-circulating cVDPV1 and cVDPV2. Seventy cVDPV2 outbreaks were reported in 38 countries. cVDPV transmission lasted for >1 year into 2024 in 15 countries. In Nigeria and Somalia, countries with security-compromised areas, persistent cVDPV2 transmission has spread to neighbouring countries. Delayed implementation of outbreak response and low-quality campaigns have resulted in further international spread. Countries can control cVDPV outbreaks with timely allocation of resources to implement prompt, high-quality responses after outbreak confirmation. Stopping cVDPV transmission requires vaccination to increase population immunity; this requires overcoming barriers to vaccinating children.
ISSN:0049-8114