2015-05-23-世界卫生组织-Meningitis_weekly_bulletin_18_-_24_May_2015_12页_1mb

Meningitis Weekly Bulletin Summary - Week 21, 2015

This summary outlines the key epidemiological and laboratory data for cerebrospinal meningitis in West Africa from the Inter-country Support Team.

I. Epidemiological Situation (Week 21):

• Total reported cases: 102
• Total deaths: 14 (lethality rate: 13.7%)
• No districts in epidemic phase or alert; data pending from Niger and Nigeria.
• Countries: Benin (6 cases, 1 death), Burkina Faso (68 cases, 6 deaths), Ghana (2 cases, 1 death), Guinea (3 cases, 0 deaths), Gambia (4 cases, 3 deaths), Mali (10 cases, 1 death), Senegal (6 cases, 2 deaths), Togo (3 cases, 0 deaths). Complétude varies by country.

II. Synthesis of Epidemiological Situation (Weeks 01-21):

• Cumulative cases: 15,967 suspected cases
• Cumulative deaths: 1,177 (lethality rate: 7.4%)
• Countries show varying completeness (e.g., 63.1% weeks reported on average).
• High case counts: Niger (7,059 cases), Nigeria (2,493 cases), Democratic Republic of the Congo (despite being outside the meningitis belt).

III. Laboratory Data (Weeks 01-21):

• Total lab samples tested: 3,108 out of 15,967 cases (19.5%)
• Predominant pathogens: Meningococcus group W (NmW) and serogroup B (NmB)
• Identification methods: PCR, LATEX agglutination, culture.

IV. Comments and Observations:

• Lethality is around 7-8% but higher in partially vaccinated countries.
• No active epidemics reported in most countries for this week, but data is incomplete for some.
• Laboratory investigations confirm cases like NmA in Ouahigouya, indicating poor vaccination coverage in some regions.