After a detailed investigation, the independent Polio Outbreak Response Assessment Team (OBRA) today recommended closure of a wild poliovirus type 1 (WPV1) outbreak in Malawi and Mozambique, the World Health Organization (WHO) regional office for Africa said in a statement.
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The outbreak was declared in February 2022, and nine cases were reported in Mozambique and neighboring Malawi. The last case was reported from Tete province in Mozambique in August 2022. The strain was genetically linked to a WPV1 strain circulating in Pakistan.
As part of the response, more than 50 million children from five nations in southern Africa were vaccinated against the virus.
The WHO said the OBRA team conducted two in-depth field reviews, along with a data review that found no ongoing wild polio transmission.
Successfully stopping the outbreak reflects collaborative efforts from African governments, health workers, communities, and partners, including the Global Polio Eradication Initiative and Rotary International.
Surveillance improvements, more wastewater tracking
Matshidiso Moeti, MD, who directs the WHO's African regional office, said, "I commend the governments of Malawi and Mozambique, as well as all those involved in the response, for their tireless efforts to contain the outbreak. It is now imperative that we continue to strengthen our immunization systems, enhance surveillance, and reach every child with life-saving vaccines."
Along with vaccination efforts in high-risk areas, health officials have established 15 new wastewater surveillance sites in affected countries. Also, groups have strengthened surveillance and data management to include real-time coverage information that includes missing settlements.