Colorized light micrograph showing Meningococcus (Neisseria meningitidis), a bacterium involved in meningitis. These bacteria are germs that are found in the nasopharynx, where they can cause mild nasopharyngitis or an asymptomatic condition. Only 1 out of 400 carriers becomes a victim of severe meningococcal infection, most often in the form of acute meningitis. Image colorization and HDRI treatments on optical microscopy; magnification X1850.