[Risk factors of infection in Xingzi County].

Objective: To explore the risk factors of infection in the residents in Xingzi County, Jiangxi Province.

Methods: Six administrative villages from different areas were randomly selected by the cluster sampling method as the study sites in Xingzi Country in 2013, and all the residents aged 5 years or above were investigated epidemiologically, and the schistosome infection was surveyed by Kato-Katz technique. The risk factors of schistosomiasis were analyzed by using the Chi-square test analysis and multivariate Logistic regression model.

[Preliminary study on applying high resolution CBERS images to identify Oncomelania snail habitats in lake and marshland regions].

Objective: To explore the preliminary application of high resolution CBERS-02B images in detecting the Oncomelania snail habitats in lake and marshland regions.

Methods: The images with high resolutions were first fused from CBERS-02B HR and CCD images, and then the potential snail habitats in Xingzi County of Jiangxi Province were extracted from high resolution CBERS images and CCD images, respectively. A total of 2 000 validation points were randomly selected for comparing the difference of distribution of these points inside and outside of the extracted two snail habitats with the McNemar chi-square test.

[Surveillance of schistosomiasis in Zhuxi Village, Xingzi County, 2005-2010].

Objective: To understand the effect of schistosomiasis control in Zhuxi Village, Xingzi County, Jiangxi Province.

Methods: According to the national scheme of schistosomiasis surveillance, we investigated the schistosomiasis epidemic in Zhuxi Village from 2005-2010. The epidemic data of schistosomiasis on the humans, farm cattle, and Oncomelania snails were collected, respectively and analyzed by using the method of Cochran-Armitage test.

[Relationship between snails and recent water level in different marshlands in Xingzi County, Jiangxi Province].

Objective: To study the longitudinal change of data on Oncomelania hupensis surveillance in different marshlands and the impact of recent water level in Xingzi County, Jiangxi Province.

Methods: All information including water level of hydrometric station and the data of snails at the marshlands of Xiguanhu, Majiawan and Ximiaoqian was collected to explore the longitudinal change of snails and analyze the relationship between snail distribution and recent water level with Spearman rank correlation analysis.

Results: The highest proportion of frames with living snails and living snail densities at Majiawan and Ximiaoqian was 89.

[Evaluation on application of common diagnosis methods for schistosomiasis japonica in endemic areas of China. III. Analysis and evaluation of underestimation of prevalence of Schistosoma japonicum infection by routine Kato-Katz technique].

Objective: To understand the rates of underestimation of Schistosoma japonicum infection by Kato-Katz technique with different stool samples and different smears in field site.

Methods: With 27 Kato-Katz thick smears (3 stool samples with 9 thick smears each) for 3 consecutive years as a "gold standard", the rates of underestimation of schistosome infection by Kato-Katz technique with different stool samples and different smears were evaluated in a schistosomiasis endemic village.

Results: The examined rates of schistosome infection increased and the rates of underestimation decreased gradually with the increase of the number of Kato-Katz thick smears examined.

A longitudinal study of comparison of the Kato-Katz technique and indirect hemagglutination assay (IHA) for the detection of schistosomiasis japonica in China, 2001-2006.

From 2001 to 2006, about one-third of the residents aged 5-65 years were selected as the subjects in a schistosome-endemic village located in Jiangxi Province, China. Every 1 year, all participants were analyzed by the Kato-Katz parasitologic examination and indirect hemagglutination assay (IHA). Statistical analysis of the results showed the k indices ranged from 0.