Meningococcal, also known as meningococci, refers to a bacterial infection caused by an organism called Neisseria meningitidis. It is commonly characterized by the inflammation of the membranes that surround and protect the brain and spinal cord. Some common synonyms for meningococcal include meningitis, bacterial meningitis, cerebrospinal fever, and meningococcal disease. Meningococcal disease is a term used to describe the conditions that may result from an infection with meningococci, which may include meningitis, septicemia, and pneumonia. The severity of this infection can range from mild to life-threatening, making it important to seek prompt medical attention if symptoms are present. Fortunately, vaccination can provide significant protection against meningococcal disease.