Abstract:

Objective  To understand the changes of endemic situation after transmission interruption of schistosomiasis, and provide evidences to adjust schistosomiasis control measures.  Methods   Annually, systematic sampling and environmental sampling method were used to survey snail distribution from March to April; net fishing and the straw curtain lure snail method were used to monitor snails from June to September, COPT test or colloidal dye test strip was used to screen the residents and Kato-Katz method to check over the positives from August to October. Advanced schistosomiasis and reservoir hosts were monitored in the years. Results  From 1998 to 2012, the total area surveyed was 23 991.48hm2 with snail areas of 44.68hm2, and newly discovered snails area was 28.18hm2. 3 885 snails were dissected with no infected snails. 5 972kg of floating debris were salvaged, 560 pieces of straw curtains were put out, 104 fishing boats and 85 fishing gears were investigated, and no snails were found. 60 164 people were examined with serological methods with the positive rate of 0.83%. The positive rate of fisherman and outpatient was relatively higher than that of the local villageres. 3 155 people were examined with fecal checks, and one cases was found. 4 915 livestock were checked, and no cases was found. In the years, the areas of environment modification for snail control were 27.53hm2, the mollusciciding areas were 35.11hm2, the mollusciciding for consolidation were 165.197hm2, and the snail areas decreased by 99.96%. Conclusion  The endemic situation of schistosomiasis was relatively stable in Jinhu County, and monitoring on input infectious source and snails should be strengthened.

Key words: Schistosomiasis , Transmission interruption , Endemic situation