Abstract:

　Objective To analyze the epidemic situation on schistosomiasis in five years after reaching the criteria of transmission control in 1995 in Dali City. . Methods. Epidemiological data of schistosomiasis during 1995-2000 were collected and analyzed. . Results . Stool positive rate in the population was increasing yearly, new cases of infection including cases under 14 years old were detected each year. Acute infection occurred during 1996-1998 consecutively. Stool positive rate in cattle was unstable. Snail-ridden area increased significantly in 1996 and spots with infected snails stayed at a higher level during 1997-2000. . Conclusion . Schistosomiasis in Dali city has been re-emerging though it was once deemed under transmission control. Possible reasons include a low drug-taking rate though distributed, frequent movement of cattle population, and less activity on snail control.

Key words: schistosomiasis, transmission control, re-emergence