2011-05-14-世界卫生组织-Meningitis_Week_19,_9_-_15_May_2011_10页_1mb

Meningitis Weekly Bulletin Summary

Inter country Support Team - West Africa
Regional Office for Africa

I. Epidemiological Situation Week 19 (09-15 May 2011)

• Total Cases: 415 reported, 39 deaths (9.4% case fatality rate).
• Most affected countries: Cameroon (33 cases, 2 deaths) and Chad (132 cases, 21 deaths).
• Alert status:
  • Cameroon: Hina district in epidemic (AR: 12.5/100,000); Mokolo district in alert (AR: 7.2/100,000).
  • Chad: 3 districts in alert: Gueledeng (AR: 7.1), Mangalmé (AR: 5.9), Oum-Hadjer (AR: 5.6).
• Leading pathogens: Streptococcus pneumoniae (Spn) and NmW135 dominated.

II. Epidemiological Synthesis for 2011 (Weeks 1-19)

• Overall situation: Stepped down; epidemic/alert districts reduced compared to main affected countries.
• Leading cause: NmA responsible for many cases in Cameroon and Chad.
• Notable elevated fatality rates (10%+) in Africa: Chad (4.4%), Central African Republic (12.9%), Togo (12.6%).
• High case fatality rates (5%+) in burden-bearing countries: Chad (4.4%), Central African Republic (12.9%), Togo (12.6%), Switzerland (costly).

III. Pathogens Frequency (Weeks 1-19)

• Spn and NmW135 remained the most prevalent among identified pathogens.
• Other notable pathogens included NmB, NmX, but mostly at lower rates.
• Overall, pneumococcus and meningococcus W135 dominated.

IV. Notes

• Data subject to change upon complete verification.
• Maps available depicting attack rates and pathogen distribution weekly comparisons.