During the past spring and early summer (1918) a study was made of an epidemic of meningococcic meningitis occurring among a civil population in a district in South China. Some of the results of the investigation have proved of sufficient interest to warrant their somewhat detailed description, in the hope that they may be of value to the medical officers of the Army and Navy combating epidemic meningitis.
The beginning of the epidemic is obscure. An epidemic of meningococcic meningitis heretofore among the Southern Chinese is practically unknown. Hence, when the first cases occurred, the proper diagnosis was not made. It was not until the second week in February that cases which were regarded previously as hemorrhagic smallpox were definitely diagnosed as epidemic meningitis. From that time until the first of June there were reported officially, 1,041 cases; but it is estimated that, including the "missed" cases, the