2012-03-03-世界卫生组织-Meningitis_Week_09,_27_February_-_4_March_2012_10页_463kb

Meningitis Weekly Bulletin Summary: Week 09, 2012

I. Epidemiological Situation (Week 09, 27 Feb - 04 Mar 2012)

1. Benin: Endemic areas remain, with alerts in Cobly, Materi, Kalale, and Sinedé. Higher attack rates reported in Nikki and Tangieta districts.
2. Burkina Faso: Solenzo district in epidemic; alerts issued for 12 districts.
3. Côte d'Ivoire: Tengrela and Toulepleu districts crossed epidemic thresholds.
4. Mali: Selingué district crossed epidemic threshold.
5. Chad: Oum-Hadjer and Beboto districts in epidemic; alerts for 8 districts.
6. Total: 852 cases, 57 deaths (6.7% case fatality rate). NmW135 and pneumococcus are primary pathogens in affected areas.

Commentary: Chad's epidemic is expanding southward. Northern Benin and Côte d'Ivoire faces an alarming situation compared to previous years.

II. Synthesis for 2012 (Weeks 01-09)

1. Chad: Highest burden with 564 deaths (9.9% case fatality rate). Limited data completeness.
2. West African Meningitis Belt: Countries like Burkina Faso, Chad, and Togo reported high numbers of cases and deaths.
3. Death Rate Variations: Notable differences: Benin (10.7%), Ghana (9.1%), Niger (12.9%), Nigeria (5.4%), Chad (6.8%), Togo (14.7%).

Commentary: Chad faces a very high burden as the epidemic is intensifying. Data from Uganda (not in the classic meningitis belt) does not require epidemic thresholds.

III. Laboratory Findings (Weeks 01-09)

1. Pathogens Identified: NmW135 and pneumococcus remain the most common pathogens, especially in alert and epidemic districts.
2. Testing Details: Most tests (e.g., Burkina Faso, 927 CSF samples) reported high levels of NmW135 cases.

IV. Graphical Representation

1. Attack Rates: Mapping showed geographical clustering of cases by district.
2. Pathogens Distribution: NmW135 and pneumococcus predominated in epidemic zones.

Key Notes: National level data completeness varied, particularly for Chad's neighboring countries. Epidemic thresholds are not applicable outside the traditional meningitis belt.