<p>Over the period, 17%(2,769/16,382) of alerts emitted by CHWs were validated as AFP cases; Cameroon: 52%(196/379), Chad: 36%(338/929, DR-Congo: 78%(1,905/2430), Niger: 3%(330/12544). AFP cases CHWs notified represented 76%(149/196) in Cameroon, Chad: 95%(321/338), DR-Congo: 86%(1,645/1,905), Niger: 92%(302/330). Silent districts were 1/60 (Chad) in 2020 and 0/71 in 2022. AFP cases notified within seven days after paralysis onset were 38%(75/196) in Cameroon, Chad: 68%(231/338), DR-Congo: 86%(1,644/1,905), Niger: 70%(231/330). The stool samples collected within 14 days after paralysis onset was 83%(162/196) in Cameroon, Chad: 94%(317/338), DR-Congo: 95%(1,815/1,905), Niger: 94%(309/330). cVDPV outbreak was detected in each country. CHWs notified also alerts on Yellow Fever, Measles, Meningitis, neonatal tetanus, cholera and COVID-19.</p>