Patients with legal communicable diseases admitted to Kawasaki Municipal Hospital between 1981 and 1986 were studied. Ages of patients were over 15 year-old. During this period 115 patients were admitted. Out of these patients 84 had Shigellosis, and 9 had amebiasis. Out of 20 Salmonellosis, 18 were due to Salmonella typhi and 2 were due to Salmonella paratyphi-A, respectively. Two were admitted because of Cholera. Out of the patients with Shigellosis, 27 were domestic and 57 were foreign infections, respectively. Most of patients were infected in South Asia or India and its neighbour countries. Shigella flexneri were mainly isolated from these patients. On the contrary, Shigella sonnei was the main causative organism of patients infected in Japan. Three amebiasis patients had liver abscesses with peritonitis, and 1 patient was a bisexual person. Out of Salmonellosis, 11 were patients with typhoid fever and 9 were carrier. One Cholera patient with severe diarrhea and acute renal failure was successfully treated and already reported elsewhere.