Effect of mid- and long-term schistosomiasis control plan and discussion of consolidation strategy in marshland endemic regions
- SHEN Xue-Hui, SUN Le-Ping, LI Ye-Fang, WANG Lin, CHEN Xiang-Ping, WANG He-Sheng, DAI Jian-Rong
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Objective Objective To evaluate the effectiveness of mid? and long?term schistosomiasis control plan and explore the con?
solidation strategy in marshland endemic regions, so as to provide an effective approach for interrupting and eliminating schisto?
somiasis in the regions. Methods Methods A prospective field study was designed. Dantu District of Zhenjiang City, a marshland schisto?
somiasis endemic region, was selected, and the“key village, key environment, and key water regions”comprehensive control
strategy was implemented according to the endemic level of schistosomiasis. The morbidity due to schistosomiasis in humans and
domestic animals, and Oncomelania hupensis snails were surveyed, and the data of the implementation of control measures were collected. The schistosomiasis morbidity and snail status were compared before and after the implementation of the mid? and long?
term plan for schistosomiasis prevention and control, and the changing trends of human, domestic animal and snail infections
were plotted. Results Results During the implementation of the plan from 2005 to 2014, 16.84 km concrete and bank protection and 9
snail sinks were built, 10 culverts re?built, 3.85 hm2
fences were constructed, 29.5 thousand domestic animals were examined
and treated, 170 cattle were eliminated, 4 930 hm2
fishing farms were built for snail control, 1 560.00 hm2
land were improved,
and 376.00 hm2
forests were built for snail control. In addition, 19 364.80 hm2
snail areas were surveyed, 4 694.6 hm2
ceived molluscicide, 207.9 thousand of people (person?times) received the examination and treatment, 69.1 thousand of harmless
toilets were built, 282.2 thousand health education materials and protection materials were allocated, 958 warning signs were es?
tablished, and 5 435 slogans were pasted or hung. After the implementation of the mid? and long?term plan, the percentages of hu?
man, bovine and snail infections appeared decline tendencies year by year, and reduced from 0.08%, 1.28% and 0.13% in 2005
to 0 in 2014, respectively, while the areas with snails and infected snails reduced from 284.34 hm2
and 55.10 hm2
in 2005 to
and 0 hm2
in 2014, with reduction rates of 74.12% and 100%, respectively. The infection rate of sheep appeared a fluc?
tuation between 2005 and 2014, with the rate of 1.13% in 2005, 0 in 2007 and 2008, rising in 2009 and then between 0.25% and
0.95% from 2009 to 2012, and reducing to 0 in 2013 and 2014. During the 10?year period, the number of cattle reduced year by
year from 2005 to 2010, and slightly increased after 2011, showing an overall stable level, while the number of sheep increased
year by year after 2006, peaked in 2010, and appeared a decline tendency since 2011, which was almost consistent with the fluc?
tuation of schistosome infection rate in sheep. Conclusions Conclusions The sustainable comprehensive control strategy with the“key vil?
lage, key environments, and key water regions”is an effective approach for schistosomiasis control in marshland endemic re?
gions. However, the endemic situation of schistosomiasis is extremely easy to repeat. The prevention and control of the impact of
sheep and wild animals on schistosomiasis transmission should be strengthened in order to consolidate the schistosomiasis con?
trol achievements gained.