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Neisseria meningitidis,group Y, was isolated from the blood and sputum of a young man with pneumonia. No potentially predisposing factors such as abnormal hemoglobins or preceding viral infection were detected. A fourfold rise in hemagglutinating antibody titers to group Y meningococcal antigen was observed.
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Samuel A. Jacobs (1974) studied this question.
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