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meningococcus, Neisseria meningitidis /mining'gokok's/, a bacterium. It is often found in the nose and throat of persons who are carriers but not ill themselves. The organism may cause blood poisoning or spinal meningitis. Meningococcal infections are not easily spread. However, crowded conditions, as may be found in army camps, group the number of carriers together and reduce some people's ability to resist the disease. Skin tumors, with bleeding beneath the skin, are major clues to the diagno