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NCDC week 40 (28 September – 4 October): 3 confirmed cases and 1 death in Bauchi State, estimated from the week's national rise of 4 cases and 1 death. NCDC's own count for the week itself is 3 cases and 1 death.

NCDC week 40 (28 September – 4 October): 1 confirmed case and no deaths in Benue State, estimated from the week's national rise of 4 cases and 1 death. NCDC's own count for the week itself is 3 cases and 1 death.

Fifty-four healthcare workers have been infected with Lassa fever in Nigeria in 2026, none of them in epi week 40. Of 2,096 contacts listed, 2,016 have completed follow-up and 49 tested positive.

NCDC's week 40 report (28 September – 4 October), the latest published: 1,138 confirmed cases and 268 deaths in 2026, a case fatality rate of 23.6%, against 924 cases and 172 deaths by the same week of 2025. Ondo, Bauchi, Taraba, Edo and Benue States account for 88% of cases.

NCDC week 39 (21–27 September): 19 confirmed cases and 4 deaths in Ondo State, estimated from the week's national rise of 19 cases and 4 deaths. NCDC's own count for the week itself is 13 cases and 4 deaths.

NCDC week 38 (14–20 September): 5 confirmed cases and 2 deaths in Ondo State, estimated from the national total of 11 cases and 4 deaths.

NCDC week 38 (14–20 September): 3 confirmed cases and 1 death in Edo State, estimated from the national total of 11 cases and 4 deaths.

NCDC week 38 (14–20 September): 3 confirmed cases and 1 death in Taraba State, estimated from the national total of 11 cases and 4 deaths.

Among the response activities in NCDC's week 38 report: a meeting with the state Commissioners of Health on plans for what the report calls the imminent outbreak, and a One Health press briefing on Lassa fever held with FMENV, FMLD and FMAFS. The national Incident Management System remains de-activated to alert mode.

NCDC week 37 (7–13 September): 12 confirmed cases and no deaths in Ondo State, estimated from the week's national rise of 18 cases and no deaths. NCDC's own count for the week itself is 17 cases and no deaths.

NCDC week 37 (7–13 September): 6 confirmed cases and no deaths in Taraba State, estimated from the week's national rise of 18 cases and no deaths. NCDC's own count for the week itself is 17 cases and no deaths.

NCDC Director-General Jide Idris announces an Accelerated Readiness Plan for the next Lassa fever peak season, which usually runs from November to April, drawn up after an After Action Review of the 2026 response. The review found delays in seeking care, self-treatment and patients visiting several providers, continued infections among health workers, household exposure through poor sanitation, unsafe food storage and rodents, a gap between facilities' capacity on paper and in practice, and limited state ownership with delays in releasing preparedness resources. The plan targets earlier detection and reporting, prompt sample transport and testing, coordinated action around confirmed cases, treatment-centre readiness, stronger infection prevention and control in high-risk facilities through an 'IPC Ring Strategy', and the 'Turn a Community Orange' approach in high-risk communities.

NCDC week 36 (31 August – 6 September): 3 confirmed cases and no deaths in Edo State, estimated from the national total of 12 cases and 1 death.

NCDC week 36 (31 August – 6 September): 7 confirmed cases and 1 death in Ondo State, estimated from the national total of 12 cases and 1 death.

NCDC week 36 (31 August – 6 September): 2 confirmed cases and no deaths in Kogi State, estimated from the national total of 12 cases and 1 death.

NCDC week 35 (24–30 August): 8 confirmed cases and 2 deaths in Ondo State, estimated from the national total of 18 cases and 5 deaths.

NCDC week 35 (24–30 August): 3 confirmed cases and 1 death in Edo State, estimated from the national total of 18 cases and 5 deaths.

NCDC week 35 (24–30 August): 7 confirmed cases and 2 deaths in Bauchi State, estimated from the national total of 18 cases and 5 deaths.

NCDC week 34 (17–23 August): 7 confirmed cases and 1 death in Ondo State, estimated from the national total of 21 cases and 1 death.

NCDC week 34 (17–23 August): 3 confirmed cases and no deaths in Edo State, estimated from the national total of 21 cases and 1 death.

NCDC week 34 (17–23 August): 6 confirmed cases and no deaths in Bauchi State, estimated from the national total of 21 cases and 1 death.

NCDC week 34 (17–23 August): 4 confirmed cases and no deaths in Taraba State, estimated from the national total of 21 cases and 1 death.

NCDC week 34 (17–23 August): 1 confirmed case and no deaths in Akwa Ibom State, estimated from the national total of 21 cases and 1 death.

NCDC week 33 (10–16 August): 5 confirmed cases and 4 deaths in Ondo State, estimated from the week's national rise of 14 cases and 12 deaths. NCDC's own count for the week itself is 14 cases and 2 deaths.

NCDC week 33 (10–16 August): 3 confirmed cases and 3 deaths in Edo State, estimated from the week's national rise of 14 cases and 12 deaths. NCDC's own count for the week itself is 14 cases and 2 deaths.

NCDC week 33 (10–16 August): 4 confirmed cases and 3 deaths in Bauchi State, estimated from the week's national rise of 14 cases and 12 deaths. NCDC's own count for the week itself is 14 cases and 2 deaths.

NCDC week 33 (10–16 August): 2 confirmed cases and 2 deaths in Benue State, estimated from the week's national rise of 14 cases and 12 deaths. NCDC's own count for the week itself is 14 cases and 2 deaths.

NCDC week 32 (3–9 August): 2 confirmed cases and 1 death in Ondo State, estimated from the national total of 4 cases and 1 death.

NCDC week 32 (3–9 August): 2 confirmed cases and no deaths in Edo State, estimated from the national total of 4 cases and 1 death.

NCDC week 31 (27 July – 2 August): 7 confirmed cases and 1 death in Ondo State, estimated from the national total of 17 cases and 2 deaths.

NCDC week 31 (27 July – 2 August): 5 confirmed cases and 1 death in Bauchi State, estimated from the national total of 17 cases and 2 deaths.

NCDC week 31 (27 July – 2 August): 3 confirmed cases and no deaths in Edo State, estimated from the national total of 17 cases and 2 deaths.

NCDC week 31 (27 July – 2 August): 2 confirmed cases and no deaths in Benue State, estimated from the national total of 17 cases and 2 deaths.

NCDC week 30 (20–26 July): 7 confirmed cases and 2 deaths in Ondo State, estimated from the national total of 17 cases and 6 deaths.

NCDC week 30 (20–26 July): 5 confirmed cases and 2 deaths in Bauchi State, estimated from the national total of 17 cases and 6 deaths.

NCDC week 30 (20–26 July): 3 confirmed cases and 1 death in Edo State, estimated from the national total of 17 cases and 6 deaths.

NCDC week 30 (20–26 July): 2 confirmed cases and 1 death in Benue State, estimated from the national total of 17 cases and 6 deaths.

NCDC week 29 (13–19 July): 9 confirmed cases and 1 death in Ondo State, estimated from the national total of 20 cases and 2 deaths.

NCDC week 29 (13–19 July): 7 confirmed cases and 1 death in Bauchi State, estimated from the national total of 20 cases and 2 deaths.

NCDC week 29 (13–19 July): 4 confirmed cases and no deaths in Edo State, estimated from the national total of 20 cases and 2 deaths.

NCDC week 28 (6–12 July): 11 confirmed cases and 2 deaths in Ondo State, estimated from the week's national rise of 27 cases and 5 deaths. NCDC's own count for the week itself is 25 cases and 4 deaths.

NCDC week 28 (6–12 July): 8 confirmed cases and 2 deaths in Bauchi State, estimated from the week's national rise of 27 cases and 5 deaths. NCDC's own count for the week itself is 25 cases and 4 deaths.

NCDC week 28 (6–12 July): 4 confirmed cases and 1 death in Edo State, estimated from the week's national rise of 27 cases and 5 deaths. NCDC's own count for the week itself is 25 cases and 4 deaths.

NCDC week 28 (6–12 July): 2 confirmed cases and no deaths in Kogi State, estimated from the week's national rise of 27 cases and 5 deaths. NCDC's own count for the week itself is 25 cases and 4 deaths.

NCDC week 28 (6–12 July): 2 confirmed cases and no deaths in Cross River State, estimated from the week's national rise of 27 cases and 5 deaths. NCDC's own count for the week itself is 25 cases and 4 deaths.

NCDC week 27 (29 June – 5 July): 5 confirmed cases and 1 death in Ondo State, estimated from the national total of 14 cases and 3 deaths.

NCDC week 27 (29 June – 5 July): 2 confirmed cases and 1 death in Edo State, estimated from the national total of 14 cases and 3 deaths.

NCDC week 27 (29 June – 5 July): 4 confirmed cases and 1 death in Bauchi State, estimated from the national total of 14 cases and 3 deaths.

NCDC week 27 (29 June – 5 July): 2 confirmed cases and no deaths in Benue State, estimated from the national total of 14 cases and 3 deaths.

NCDC week 27 (29 June – 5 July): 1 confirmed case and no deaths in Kogi State, estimated from the national total of 14 cases and 3 deaths.