Meningococcal disease is caused by a bacteria called Neisseria meningitidis which can be spread from person to person through droplets from coughing, sneezing, kissing, or sharing foods, drinks and utensils. This disease can either lead to meningoccocemia (if the bacteria enters the bloodstream), or meningitis (if the bacteria infects the tissue covering the brain and the spinal cord). It most commonly affects babies, teens, and young adults.