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[Oncomelania snail recurrence after schistosomiasis transmission interrupted in Chuxiong City].

OBJECTIVE
To analyze the status of Oncomelania snail recurrence after schistosomiasis transmission interrupted in Chuxiong City, Yunnan Province, so as to provide the evidence for establishing the control strategy.


METHODS
The data of snail surveillance since 1994 were collected and analyzed.


RESULTS
The schistosomiasis endemic situation was stable, but the area with snails increased again seriously. In the years when the snail area was most (27.8 hm2 in 2004 and 28.0 hm2 in 2005) , it reached 12.9 times of the standard level.


CONCLUSION
The Oncomelania snail recurrence is obvious, therefore, the snail severance still need to be strengthened.