TRENDS IN ONCOMELANIA HUPENSIS DISTRIBUTION IN YIXING CITY, JIANGSU PROVINCE FROM 2008 TO 2024
10.3969/j.issn.1005-0507.2026.03.002
- VernacularTitle:江苏省宜兴市2008—2024年螺情变化趋势
- Author:
Jing LIANG
1
;
Zhi-qiang XUE
1
;
Xue-bing LI
1
;
Di WU
1
;
Han WANG
2
Author Information
1. Yixing Center for Disease Control and Prevention, Yixing 214200, Jiangsu, China
2. Hainan Medical University, Haikou 570100, Hainan, China
- Publication Type:Journal Article
- Keywords:
Oncomelania hupensis;
Hilly regions;
Joinpoint regression model;
Yixing City;
Schistosoma japonicum
- From:
Acta Parasitologica et Medica Entomologica Sinica
2026;33(3):168-172
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate changes in the distribution of Oncomelania hupensis snails in Yixing City, Jiangsu Province, from 2008 to 2024, and to provide insights to guide formulation of O. hupensis snail investigation and surveillance programs. Methods Data from O. hupensis snail surveys in Yixing City from 2008 to 2024 were collected. Trends in snail habitat site numbers, snail-infested areas, proportion of total area with snail habitats, occurrence of frames with living snails, and density of living snails in snail habitats in hilly regions of Yixing City were evaluated from 2008 to 2024 by applying a Joinpoint regression model to collect annual percent change (APC) and average annual percent change (AAPC) data. Results From 2008 to 2024, a total of 193.815 hm2 of snail-infested area was found within Yixing City, of which 191.765 hm2 (accounting for 98.94%) was distributed in hilly regions. A total of 344 snail infestation sites in hilly regions were identified. The average occurrence rate of living snail frames in snail habitats was 8.650% and the average living snail density in snail habitats was 0.246 per 0.1 m2. No Oncomelania snails were positively identified. The number of snail habitat sites in hilly regions of Yixing City showed no significant decreasing trend (AAPC=-2.8%, P=0.527). Similarly, no significant increasing trend in snail-infested area (APC=AAPC=5.7%, P=0.328) was found. The occurrence rate of living snail frames in snail habitats showed no significant increasing trend (APC=AAPC=5.1%, P=0.583). Living snail density in snail habitats also showed no significant increasing trend (APC=AAPC=3.2%, P=0.598). Conclusions From 2008 to 2024, snail infestation has persisted in the hilly areas of Yixing City with an unclear variation trend. The quality of snail investigation and snail surveillance system should be strengthened to permit timely identification of hidden dangers and rapid risk responses, thereby preventing schistosomiasis outbreaks.
