2012-01-27-世界卫生组织-Meningitis_Week_04,_23_-_29_January_2012_8页_528kb

Meningitis Weekly Bulletin Summary for Week 04, 2012

This summary outlines the key epidemiological findings from the Meningitis Weekly Bulletin for the week of 23-29 January 2012, published by the Inter country Support Team - West Africa regional office. The bulletin covers cases, deaths, lethality rates, and laboratory results across several African countries.

I. Epidemiological Situation for Week 04, 2012

• Overall Cases and Deaths: A total of 314 meningitis cases were reported, with 34 deaths, resulting in a lethality rate of approximately 10.8%. High attack rates were observed in specific districts.

  • Benin: 33 cases, 5 deaths (15.2% lethality), with Peréré district in epidemic status (attack rate of 15.7 cases/100,000).
  • Burkina Faso: 122 cases, 19 deaths (15.6% lethality), with alerts in multiple districts.
  • Côte d'Ivoire: 24 cases, 4 deaths (16.7% lethality), with Tengrela district in alert (attack rate of 5.3 cases/100,000).
  • Tchad: 78 cases, 2 deaths (2.6% lethality), with four districts in alert (e.g., Bedjondo: 8.5 cases/100,000).

• Laboratory Results and Pathogens:

  • Tests identified Nm A as the predominant pathogen in many regions, with varying attack rates.
  • PCR, LATEX, and culture methods were used for confirmation.
  • In Chad, districts without MenAfriVac introduction showed high NmA cases (e.g., Goundi, Bedjondo, Pala).

• Key Comments:

  • Some countries, like Cameroun and Mali, reported low case numbers or no deaths.
  • A vaccination campaign with polysaccharidic AC vaccine is planned for Benin's northern regions. Others, like Tchad, await further confirmation.

II. Synthesis for 2012 (Weeks 01–04)

• Cumulative Cases and Deaths: By week 04, there were 956 total cases and 95 deaths (9.9% lethality rate).

  • Benin had the highest percentage of districts in alert or epidemic (100.0% over weeks 01–04).
  • Tchad and Burkina Faso showed widespread alerts.

• Vaccine Preparation: Efforts are ongoing, including vaccination plans in regions previously affected.

III. General Notes From the Bulletin

• The epidemic season remains active, with alerts increasing in areas that were major foci in 2011.
• Laboratory surveillance is being reinforced to enable rapid responses.
• No data available for countries like Central African Republic and Ethiopia due to applicability issues.

This bulletin highlights the ongoing challenges, emphasizing the need for continued surveillance and vaccination efforts.