Retrospective analysis on the data of schistosomiasis endemics from 1970 to 2008 in Xinmin Beach of Gaoyou City
Objective To explore the pattern of schistosomiasis endemic changes so as to provide sci-entific basis for schistosomiasis control in lake and marshland regions. Methods The data from 1970-2008 reflecting the prevention and control activities in Xinmin Beach of Gaoyou City and important historical events related with schistosomiasis control were collected retrospectively. The patterns of control and epidemiology of schistosomiasis at various control stages were comprehensively analyzed through calculating the snails infested areas, percentage of frame with snails, average density of living snails, stool positive rates and immunological rates in human beings etc. Results Control measures were adjusted from general survey and treatment to integrated control, classified survey and treatment in different stages of infection control (1970-1975), trans-mission control(1976-1994) and transmission interruption(1995-2008), resulting in the significant reduction of prevalence rates of schistosomiasis both in human beings and livestock as well as the serological positive rate in human beings. However, the indicators of snails rebounded repeatedly. During these three stages, the largest ratio of detected snails areas accounting for surveyed areas were 79.42%, 30.30%, 8.10%, respectively, while the maximum value of percentage of frame with snails and average density of living snails were 10.48%, 2.97%, 1.45% respectively and 0.612 3 snails per 0.1 m2, 0.328 4 snail per 0.1 m2, 0.077 3 snails per 0.1 m2 respectively. Indicators of snails were rebounded in 1998 (12 years after reaching transmission control crite-ria) and 2001(6 years after interruption the transmission of schistosomiasis). The stool positive rate in human beings was 35.98%(1 505/4 183) in 1970, reaching the highest level, and decreased to 3.76%(261/6 940) in 1976. Since 1984, no stool positives were found. The antibody positive rates determined by circumoval precip-itin test presented a decreasing trend, from 8.97%(200/2 230) in 1984 to 0.26%(6/2 300) in 1995 and then 0(0/711) in 2004. Conclusion Appropriate interventions should be adjusted and implemented adapting to local setting and control stages. To prevent snails rebound, cooperative prevention and control and surveillance should be strengthened.
Lake and marshland endemic regionsSchistosomiasisEndemicityAnalysis
NETL
NSTL
万方数据
维普
