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1969: The first YF epidemic recorded. - Benue State (Town of Jos) - After long rainy season - 208 cases, 60 deaths (reported) - CFR 29% - 55 cases laboratory confirmed - Real incidence suspected 10,000 cases and 1,000 deaths - Majority of cases 15-34 y/o - M:F sex ratio: 4:1. - Aedes luteocephalus incriminated
1974: 23 cases reported in South East.
1979: 23 cases reported (no deaths) in Bauchi state.
June 1986 - March 1987 - Outbreak epicentre in Benue State - Spread through Cross River, Imo and Anambra states - Epidemiological peak in November - Spread to SW in Nov, following nomadic movements - 559 cases and 200 deaths reported - CFR 36% - 17 million people vaccinated in SE (Benue, Cross River); SW (Oyo, Ogun, Ondo, Kwara) and NW (Niger, Sokoto, Kaduna) - Aedes africans incriminated.
Jan - Sep 1987 - Outbreak in Oyo and Ogun states - Epidemiological peak in June 1987 - 1,0179 cases with 508 deaths - CFR 47% - M:F sex ratio: 1.4
April - July 1987 - Outbreak in Oyo state - Ogbomosho became the epicentre - 805 cases and 416 deaths reported - CFR 52% - Real incidence estimated (by serological testing) to be around 800,000 cases (20% of the pop) - 19 laboratory confirmed by viral insulation (5) and serology (4) - Aedes aegypti incriminated
August - September 1987 - New outbreak developed (hypothesised to be due to wandering pastoralists) in Niger and Sokoto states - Epidemiological peak in September - 704 cases and 165 deaths reported / CFR 38% - Aedes aegypti incriminated
June 1988 - End of 1989 Cases were reported in Kaduna, Katsina, Kano and Bauchi states. - 1067 cases in Kano - 375 cases in Kaduna - 150 cases in Bauchi
1990: Cases reported in Gongola and Borno states. - d'Anambra - 54 cases, 49 deaths - Bauchi - 1 case - Bendel - 50 cases, 30 deaths - Borno - 272 cases, 25 deaths - Cross River - 10 cases - Gongola - 3, 166 cases, 48 deaths - Kaduna - 13 cases, 1 death - Kano - 366 cases, 64 deaths - Sokoto - 118 cases, 24 deaths
1989: - Bendel - 79 cases, 49 deaths - Borno - 12 cases - Imo - 1,308 cases, 224 deaths - Katsina - 8 cases, 7 deaths - Kwara - 13 cases, 13 deaths - Lagos - 1 case - Oyo - 100 cases, 60 deaths - Plateau - 2 cases - Sokoto - 30 cases
12 states affected: Kano, Katsina, Bendel, Borno. - The epidemiological peak in October - 2,561 cases, 661 deaths reported - CFR 26% - 54% cases <15 y/o - M:F sex ratio 1.1
October 1993 - January 1994 - Outbreak occurred in Orsu - Outbreak following strong rains and floods which had resulted in mass migration - YF extended to Cameroon for the 2nd time in 5 years. - Awoidemili & Eziawa communes the most affected (AR 1.5 and 1.1 per 1,000 inhabitants respectively) - Epidemiological peak in November. - 1,227 cases and 415 deaths reported - CFR 34% - M:F sex ratio 1.3 - 42, 000 people vaccinated in Orsu
April - July 1995 - Urban outbreak in Delta - Unknown number of cases - Aedes aegypti incriminated
April - May 2000 - Kano and Ekiti affected - 6 cases (2 lab confirmed) - Mass vaccination campaign
2017 - YF case confirmed in Kwara State - Reactive mass vaccination campaign
1970: 106 cases reported. - Benue & Ito. District of d'Okwoga states. - 22 cases, 3 deaths (laboratory confirmed) - Real incidence estimated at 786 deaths. - Aidogodo most strongly affected commune. - Epidemiological peak in Nov. - Aedes africanus incriminated - 1.5 million were vaccinated in response - Co-circulating arboviruses identified.
1971: 1 laboratory confirmed case of YF in Umuahia in Jan 1971.
1973: 2 cases reported in Cross river state. Real incidence estimated to be >1,000 cases.
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