[Re-emergence of schistosomiasis in Dali City after the criteria of transmission control were met].
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.


CONCLUSIONS
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.
Li
Ke-lin
KL
Division of Disease Control of Yunnan Provincial Health Bureau, Kunming 650021.
Yang
Guang-huai
GH
Duan
Suo-sheng
SS
Xia
Guang-hui
GH
D000818:Animals; D002417:Cattle; D002681:China / Q000453:epidemiology; D006801:Humans; D015995:Prevalence; D012552:Schistosomiasis / Q000453:epidemiology* / Q000517:prevention & control; D012908:Snails