2012-05-19-世界卫生组织-Meningitis_Week_20,_14_-_20_May_2012_10页_512kb

Meningitis Weekly Bulletin Summary - Week 20, 2012

Date Range: May 14–20, 2012
Region: West Africa, Outside Meningitis Belt

I. Epidemiological Situation (Week 20, 2012)

• Total Cases: 222 cases reported across 11 countries; highest in Nigeria (22 cases) and Burkina Faso (87 cases).
• Fatalities: 13 deaths (5.9% overall fatality rate); highest in Côte d’Ivoire (33.3%).
• Alert District: Nanssian district in Côte d’Ivoire (attack rate: ~9.6 cases/100,000).
• Vaccination Coverage: Below 100% in Burkina Faso, Chad, Mali, Niger.
• Leading Pathogens: NmW135 and Streptococcus pneumoniae (Spn) were most frequent in epidemic districts.

Key Outlier: Centrafrique and RD Congo data missing or incomplete.

II. Synthesis (Weeks 1–20, 2012)

• Overall Trends: Gradual decrease in cases from Weeks 12–14.
• Outbreaks: Chad and Cameroon had districts exceeding threshold levels (two in each country).
• Case Fatality Rates: Highest in Burkina Faso (10.6%), Niger (19%), Chad (4.1%).
• Laboratory Results: NmA strains concentrated in unvaccinated regions (Nord, Extrême-Nord, Cameroon).

III. Additional Notes

• Thresholds: Applicable only for countries within the meningitis belt.
• Pathogens: NmW135 and Spn remained primary pathogens among alerts.

*Disclaimer: Data subject to change post-analysis.*