SummaryDescription of an infectious hepatitis epidemic occurred among a hospital ward of patients presenting diabetes mellitus.The causative virus is probably virus B. The outbreak was caused by use of an insulin’s syringe inadequately sterilized in alcohol, between two injections. There was no latent hepatitis.Age and diabetes mellitus were responsible for high mortality. The ana- tomo-pathological lesions were that of acute yellow atrophy.The epidemic was stopped by preventive gamma globulins’injections.