—meningococcal, meningococcic /meuh ning'goh kok"ik, -kok"sik/, adj./meuh ning'goh kok"euhs/, n., pl. meningococci /-kok"suy, -see/.a reniform or spherical bacterium, Neisseria meningitidis, that causes cerebrospinal meningitis.[1890-95; < NL; see MENINGES, -O-, COCCUS]
* * *Neisseria meningitidis, the bacterium that causes meningococcal meningitis in humans, the only natural hosts in which it causes disease.Meningococci are spherical, frequently occur in pairs, and are strongly gram-negative (see gram stain). They enter the nasal passage and may cause no symptoms (up to 30% of the population may harbour them between epidemics), or they may enter the bloodstream and produce the symptoms of meningitis.
* * *▪ bacteria speciesthe bacterium Neisseria meningitidis, which causes meningococcal meningitis in humans, who are the only natural hosts in which it causes disease. The bacteria are spherical, ranging in diameter from 0.6 to 1.0 μm (micrometre; 1 μm = 10-6 metre); they frequently occur in pairs, with adjacent sides flattened. They are strongly gram-negative. These bacteria enter the nasopharynx; meningococcal infections in the nasopharynx may cause no symptoms—up to 30 percent of the population may harbour them between epidemics—or may enter the bloodstream and produce the symptoms of meningitis.
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