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Nigeria: Lassa Fever Outbreak - Jan 2019

Disaster types

On 21 January 2019, the Nigeria Centre for Disease Control (NCDC) declared an outbreak of Lassa fever following an increase in the number of cases. From 01 to 27 January 2019, a total of 213 confirmed cases including 41 deaths were reported from sixteen states (Edo, Ondo, Ebonyi, Bauchi, Plateau, Taraba, Gombe, Anambra, Kaduna, Kwara, FCT, Benue, Rivers, Nassarawa and Kogi States) across 40 Local Government Areas (LGAs). This represents a significant increase in the number of cases reported compared to at the same period in 2018. With the outbreak confirmed, WHO intensified its technical assistance to State and Federal authorities in investigation and response to the outbreak. (WHO, 1 Feb 2019)

The number of confirmed cases reported across Nigeria remains high. In week 6, 2019 (week ending 10 February 2019), 37 new confirmed cases including 10 deaths (case fatality ratio = 27%) were reported from nine states across Nigeria. The majority of cases were reported from Ondo (12) and Edo (10) states. The number of confirmed cases reported in week 6, 2019 represents a slight decrease compared to week 5 when 68 confirmed cases were reported. (WHO, 14 Feb 2019)

The Nigeria Centre for Disease Control (NCDC) has reported a decrease in the number of Lassa fever cases reported weekly in the country. This is following the intensive response to the Lassa fever outbreak declared in Nigeria on the 21st of January 2019...In the last reporting week ending on the 17th February 2019, 25 new confirmed cases of Lassa fever were reported. So far, a total of 355 confirmed cases with 75 deaths have been recorded between January 1st and February 17th, 2019 from 20 states across 57 Local Government Areas. Over the past three weeks, there has been a downward trend in new cases. The number of new cases being reported are lower, compared to the same period during the 2018 outbreak. (Govt, 25 Feb 2019)

Cases of Lassa fever continue to be reported across Nigeria in 2019, with a declining trend since week 10. During week 15 (week ending on 14 April 2019), three new confirmed cases with zero deaths were reported from two states – Edo (one) and Plateau(two). This is the lowest number of cases reported since the beginning of the year, with more than 80 cases reported during the peak of the outbreak in week 4 (week ending on 27 January 2019).
From 1 January to 14 April 2019, a cumulative total of 555 confirmed and probable cases with 137 deaths (case fatality ratio 24.7%) have been reported across Nigeria. Eighty-one local government areas across 21 states have reported at least one confirmed case since the beginning of 2019. (WHO, 21 Apr 2019)

Following a joint epidemiological review by the Nigeria Centre for Disease Control (NCDC), the World Health Organisation in Nigeria (WHO Nigeria) and other partners, the NCDC has announced the end of the emergency phase of the 2019 Lassa fever outbreak. (Govt, 30 May 2019)