Events
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 incriminated1974: 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: 1.4April - 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 incriminatedAugust - 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 incriminatedJune 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 Bauchi1990: 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 deaths1989:
- 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 cases12 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 1.1October 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 OrsuApril - July 1995
- Urban outbreak in Delta
- Unknown number of cases
- Aedes aegypti incriminatedApril - May 2000
- Kano and Ekiti affected
- 6 cases (2 lab confirmed)
- Mass vaccination campaign2017
- YF case confirmed in Kwara State
- Reactive mass vaccination campaign1970: 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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