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| Neisseria meningitidis, Serogroup A Meningococcus, Serogroup A | Meningococci, Serogroup A Strains of Neisseria meningitidis responsible for most outbreaks of meningococcal disease in Western Europe and the United States in the first half of the 20th century. They continue to be a major cause of disease in Asia and Africa, and especially localized epidemics in Sub-Sahara Africa. |