Spatial and temporal clustering characteristics of typhoid and paratyphoid fever and its change pattern in 3 provinces in southwestern China, 2001-2012
10.3760/cma.j.issn.0254-6450.2017.11.013
- VernacularTitle:中国西南3省(自治区)伤寒/副伤寒流行的时空聚集性特征及变迁研究
- Author:
Luxi WANG
1
;
Bo YANG
;
Meiying YAN
;
Yaqing TANG
;
Zhongcheng LIU
;
Ruiqin WANG
;
Sa LI
;
Lin MA
;
Biao KAN
Author Information
1. 102200,北京市昌平区疾病预防控制中心
- Keywords:
Typhoid and paratyphoid fever;
Spatial and temporal characteristics;
Clustering
- From:
Chinese Journal of Epidemiology
2017;38(11):1504-1508
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the spatial and temporal clustering characteristics of typhoid and paratyphoid fever and its change pattern in Yunnan, Guizhou and Guangxi provinces in southwestern China in recent years. Methods The incidence data of typhoid and paratyphoid fever cases at county level in 3 provinces during 2001-2012 were collected from China Information System for Diseases Control and Prevention and analyzed by the methods of descriptive epidemiology and geographic informatics. And the map showing the spatial and temporal clustering characters of typhoid and paratyphoid fever cases in three provinces was drawn. SaTScan statistics was used to identify the typhoid and paratyphoid fever clustering areas of three provinces in each year from 2001 to 2012. Results During the study period, the reported cases of typhoid and paratyphoid fever declined with year. The reported incidence decreased from 30.15 per 100000 in 2001 to 10.83 per 100000 in 2006 (annual incidence 21.12 per 100000);while during 2007-2012, the incidence became stable, ranging from 4.75 per 100000 to 6.83 per 100000 (annual incidence 5.73 per 100000). The seasonal variation of the incidence was consistent in three provinces, with majority of cases occurred in summer and autumn. The spatial and temporal clustering of typhoid and paratyphoid fever was demonstrated by the incidence map. Most high-incidence counties were located in a zonal area extending from Yuxi ofYunnan to Guiyang of Guizhou, but were concentrated in Guilin in Guangxi. Temporal and spatial scan statistics identified the positional shifting of class Ⅰ clustering area from Guizhou to Yunnan. Class Ⅰ clustering area was located around the central and western areas (Zunyi and Anshun) of Guizhou during 2001-2003, and moved to the central area of Yunnan during 2004-2012. Conclusion Spatial and temporal clustering of typhoid and paratyphoid fever existed in the endemic areas of southwestern China, and the clustering area covered a zone connecting the central areas of Guizhou and Yunnan. From 2004 to 2012, the most important clustering area shifted from Guizhou to Yunnan. Findings from this study provided evidence for the identifying key areas for typhoid and paratyphoid fever control and prevention and allocate health resources.
