Yellow fever in Africa 2022: Vaccination coverage is insufficient


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World Health Organization (WHO) African Region recently Post an update on yellow fever In the region, here are some highlights of the report:

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In 2022, 12 countries in WHO’s African region reported outbreaks of yellow fever (Cameroon, Central African Republic, Chad, Côte d’Ivoire, Democratic Republic of the Congo, Ghana, Kenya, Niger, Nigeria, Republic of the Congo, Sierra Leone and Uganda). Eight of these countries are experiencing continued transmission as of 2021 (Cameroon, Central African Republic, Chad, Côte d’Ivoire, Democratic Republic of the Congo, Ghana, Nigeria, and Republic of the Congo) and four countries have reported recently confirmed cases (Kenya, Niger, Sierra Leone, and Uganda). One country, Gabon, reported cases in 2021, but no further cases were recorded in 2022 indicating the end of the outbreak in Gabon.

From 1 January 2021 to 19 December 2022, a total of 203 confirmed cases and 252 probable cases with 40 deaths (CFR 9%) were reported to WHO from 13 countries in the WHO African Region, with an additional 49 plaque-reducing neutralization tests (PRNT) Positive samples are currently awaiting classification.

Universal coverage of yellow fever vaccination in the region is not sufficient to provide herd immunity. According to estimates by the World Health Organization and UNICEF (WUENIC), in 2021, coverage of routine yellow fever immunization in the African Childhood Vaccination Region was 48%, well below the 80% threshold required to confer population immunity against yellow fever indicating a vulnerable population to injury. are at risk of infection with YF and the risk of continued transmission. Country immunization coverage (WUENIC) estimates for 2021 are as follows: Cameroon (54%), Central African Republic (41%), Chad (45%), Congo (67%), Côte d’Ivoire (65%), Democratic Republic of the Congo Congo (56%), Gabon (64%), Ghana (94%), Kenya (7%), Niger (80%), Nigeria (63%), Sierra Leone 85% (Uganda).

Vaccination is the primary means of preventing and controlling yellow fever. Countries that have reported cases and outbreaks of yellow fever are among the highest priority countries of the EYE strategy. These countries have introduced yellow fever vaccination into their routine immunization schedule for those 9 months of age, as well as requirements for proof of yellow fever vaccination for all incoming travelers >= 9 months, with the exception of Chad and Nigeria, which require proof of vaccination only for travelers coming from countries at risk of transmission YF. Reviewing the risk analysis and scope of immunization activities to protect the population can help avoid risks of future disease outbreaks.

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Yellow fever is an acute viral hemorrhagic fever spread by the bites of infected mosquitoes.

Symptoms of yellow fever (fever, chills, headache, backache, and muscle aches) develop 3-6 days after infection. About 12% of people infected with the yellow fever virus develop severe disease that can lead to liver disease, bleeding, shock, organ failure, yellowing of the skin (jaundice), and sometimes death. Of those who become severely ill, 30-60% die.

If you develop any of these symptoms, seek healthcare immediately.

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