Meningococcal Disease Causes / Meningococcal disease is a rare, serious illness caused by a bacteria (neisseria meningitidis).. Bacteria called neisseria meningitidis cause meningococcal disease. When the linings of the brain and spinal . Meningococcal disease can refer to any illness that is caused by neisseria meningitidis, also known as meningococcus bacteria. Bacteria and viruses are the two main causes of meningitis. Meningococcal disease is caused by bacteria called neisseria meningitidis. · high fever (more than 104°f) · headache · vomiting · stiff neck · rash · sensitivity to light · confusion · sleepiness. Meningococcal meningitis is a form of meningitis caused by a specific bacterium known as neisseria meningitidis. Bacteria and viruses are the two main causes of meningitis. Meningococcal disease is caused by a bacterium called neisseria meningitidis (also known as meningococcal . According to the centers for disease control and prevention (cdc), meningococcal