Yellow Fever Outbreak in Nigeria: NCDC Situation Report #27 (6 - 12 August 2018)

Situation Report
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  • In this reporting week 6 th August – 12th August, 2018

o A total of 163 suspected cases were added to the national line list

o No new in-country presumptive positive in the reporting week

o Last presumptive positive case in the Nigerian lab was 2 nd July, 2018 reported from the Maitama District Hospital Abuja: The case from Kabba/Bunu LGA of Kogi State

o Last IP Dakar confirmed case from Nigeria was on 6 th June, 2018 from River State

o Yellow fever reactive vaccination campaign is on-going in Danja LGA of Katsina State


  • A yellow fever outbreak is currently active in Nigeria. Confirmed cases have been recorded in 11 States (Kwara, Kogi, Kano, Zamfara, Kebbi, Nasarawa, Niger, Katsina Edo, Ekiti and Rivers State): in 22 Local Government areas (LGAs) [Table 1]

  • 126 samples (presumptive positive and inconclusive) in 58 LGAs sent to IP Dakar

  • All Nigerian states have reported suspected cases in 530 (68.5%) LGAs

  • From the onset of this outbreak on September 12, 2017, a total of 2,581 suspected yellow fever cases have been line-listed as at week 32 [6 th August – 12th August, 2018 (Table 1)].

  • Of the 2,418 suspected cases, 2,396 (92.8%), had blood samples collected and sent to the Nigerian testing laboratories for confirmation

  • Of the 2,396 samples collected, 110 (4.6%) tested positive for yellow fever (presumptive positive cases) and 16 (0.7%) inconclusive results in six Nigerian laboratories [Tables 1]

  • As at Epi week 32 [6 th August – 12th August, 2018], 47 (37.3%) samples out of the 126 (Presumptive positive and inconclusive) samples in Nigeria have been confirmed positive by IP, Dakar. 77 samples were negative; 2 sample are awaiting results from IP Dakar [Table 1].

  • Predominant age groups affected among the suspected cases are 20 years and below (children and younger adults) accounting for 1612 (62.5%) [Male 986 (38.2%): Female 626 (24.3%)] o Median age is 15 years (range 1 – 92 years) o Male to female ratio is 1.4 to 1 (male 57.8%, female 42.2%):

  • Predominant age groups affected among the confirmed cases are 20 years and below (children and younger adult) accounting (57.4%) o Among the confirmed, male to female ratio is 1.8:1 (male 63.8%, female 36.2%) o Median age is 18 years (range 2 – 63)

  • Yellow fever vaccination campaigns have been successfully completed in six states o Nasarawa, Cross River, Akwa Ibom; Kogi, Kwara and Zamfara and in fifty-eight political wards in 25 LGAs in Borno State o 2018 phase 2 PMVC to be implemented from 8 th – 17 th November, 2018 in Sokoto, Kebbi,
    Niger, FCT, Plateau and Borno States

  • Total number of deaths in all cases (suspected, probable and confirmed cases) is 47, while 10 deaths were recorded among confirmed cases only. Therefore, the case fatality ratio (CFR) for all cases (including suspected, probable and confirmed) is 1.8%, and 21.3% for confirmed cases.