2012-03-24-世界卫生组织-Meningitis_Week_12,_19_-_25_March_2012_14页_656kb

Summary of the Weekly Meningitis Bulletin for Week 12, 2012

• Epidemic Situation (Week 12): This week saw an increase in meningitis cases across several West African countries. Burkina Faso reported 584 cases with 47 deaths, driven primarily by Neisseria meningitidis W135, with six districts in full epidemic and fifteen in alert. Mali had 61 cases with no deaths, but the Koutiala district crossed the alert threshold. Nigeria's Yorro LGA (Taraba State) exceeded the epidemic threshold with high attack rates. Chad reported 318 cases, mostly due to NmA, amid ongoing vaccination efforts. Other countries like Côte d'Ivoire and Togo also contributed to the caseload, but with lower rates. Overall cases were high, with 62% of deaths due to W135 or pneumococcus.

• Key Findings: The epidemic is escalating in Burkina Faso and Chad, where NmW135 remains the dominant pathogen. A reactive vaccination campaign with quadrivalent ACWY or MenAfriVac vaccines has been planned or is underway in several countries to control outbreaks. Mortality rates varied, with some regions showing high lethality, and cases are susceptible to change as data is not yet complete.

• Additional Context: The bulletin includes cartographic representations showing attack rates and pathogen distribution. Globally, the 2012 season has been severe, with Burkina Faso and other nations showing persistent high case counts. The Inter Country Support Team emphasizes the need for enhanced surveillance and timely interventions.