[Effect of "one village, one control strategy" on schistosomiasis control in Qianjiang City].

OBJECTIVE: To evaluate the effect of "one village, one control strategy" on schistosomiasis control in Qianjiang City. METHODS: The villages with human and/or bovine schistosome infection rate being more than 1.5% in 2011 were chosen as the trial villages. According to the epidemic characteristics of schistosomiasis and control difficulties of the villages, the "one village, one control strategy" was performed and the control effects were evaluated. RESULTS: By the end of 2013, the infection rates of human and bovine in the trial villages decreased by 45.91% (χ2 = 469.19, P < 0.01) and 49.38% (χ2 = 11.46, P < 0.01), respectively, and all the infection rates of human and bovine in those villages were less than 1%. CONCLUSION: The "one village, one control strategy" is effective for schistosomiasis control, which can rapidly reduce the prevalence of schistosomiasis.

[Measures and effectiveness of comprehensive schistosomiasis control along Xinglong River in Qianjiang City].

OBJECTIVE: To evaluate the effect of comprehensive control of schistosomiasis along the Xinglong River in Qianjiang City, so as to provide the evidence for improving schistosomiasis control. METHODS: The comprehensive control measures including infection source control and Oncomelania hupensis snail eradication were surveyed along the Xinglong River in Qianjiang City. RESULTS: The prevalence of schistosomiasis was under control, that was the human and cattle infection rates decreased by 53.77% and 100% respectively, the snail area decreased by 26.9%, the mean density of living snails decreased by 25.5%, and no infected snails was found. CONCLUSIONS: The comprehensive control measures along the Xinglong River are effective, and the management and surveillance of snail environments still should be strengthened.

[Sequential implementing farmland consolidation and replacing cattle with machine to control schistosomiasis].

OBJECTIVE: To evaluate the schistosomiasis control effect of sequential farmland consolidation and replacing bovine with machine. METHODS: Two farmlands of Qianjiang City were selected as experimental districts, and the sequential implementing farmland consolidation and replacing bovine with machine were carried out. The schistosomiasis epidemic situation was observed continuously. RESULTS: From 2008 to 2012, the human schistosome infection rate decreased by 78.90%, in which the seropositive rate decreased by 47.88% (chi2 = 368.58, P < 0.01) and the stool positive rate decreased by 55.88% (chi2 = 29.92, P < 0.01). The schistosome infection rate of cattle was 2.54% in 2008, but from 2009, there were no cattle in the area. The Oncomelania snail area decreased by 54.78%, and the rate of frames with living snails and the mean density of living snails decreased by 76.49% and 72.63% (chi2 = 11.34, 12.86, P < 0.01) respectively. Since 2009, no infected snails were found. CONCLUSION: The sequential implementing farmland consolidation and replacing cattle with machine can effectively control the transmission of schistosomiasis.

[Molluscicidal effect of LDS in field in marshland areas].

The molluscicidal effects of salt of quinoid-2', 5-dichloro-4'-nitrosalicylanilide (LDS) and 50% wettable powder of niclosamide ethanolamine salt (WPN) were observed by three methods of immersion, insufflations and powdering. The results showed that there was no statistic difference between the snail control effects of LDS and WPN, which suggested that LDS had a good molluscicidal effect in marshland areas.