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.
Jacobs SA, Norden CW. Pneumonia Caused by Neisseria meningitidis. JAMA. 1974;227(1):67–68. doi:10.1001/jama.1974.03230140037008
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