CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES >
Epidemiological characteristics of visceral leishmaniasis in Shanxi Province, 2010—2019
Received date: 2020-12-22
Revised date: 2021-01-28
Online published: 2021-07-05
Objective To understand the epidemic status and transmission trend of kala-azar in Shanxi Province, and to provide informative basis for formulating appropriate control strategy for kala-azar. Methods Information of kala-azar cases who were residents in Shanxi Province, reported from 2010 to 2019 from the National infectious Disease Surveillance Reporting and Management System, was collected for a descriptive epidemiological analysis. In addition, epidemiological investigation information of the reported cases was collected individually to analyze the change of epidemic situation of kala-azar in different counties.Results A total of 140 cases of kala-azar were reported in Shanxi from 2010 to 2019, with an annual average incidence of 0.04 per 100 000. Among them, 131 were local cases, 7 were imported cases, and the source of infection in 2 cases was unknown. No more than 4 kala-azar cases were reported each year in 2010—2014, but the reported yearly incidence showed a trend of increase from 2015 to 2019 (8 cases, 9 cases, 18 cases, 37 cases and 52 cases respectively). Furthermore, the epidemic area expanded year by year. More than 10 cases were reported in the two counties where the kala-azar endemicity was higher severe in 2019. The reported cases were mainly in cities of Yangquan, Changzhi and Linfen, accounting for 92.14% (129/140) of the total. The reported cases of kala-azar were significantly increased from 4 in 2016 to 33 in 2019 in Yangquan City, while the epidemic situation was relatively stable in Linfen and Changzhi. During 2010-2019 there were eight new epidemic counties located in four cities, which were Yangquan (3 cases), Changzhi (2 cases), Linfen (2 cases) and Yuncheng (1 case), and 6 epidemic reemerging counties located in four cities, which were Changzhi (1 case), Jinzhong (1 case), Yangquan (1 case) and Linfen (3 cases). Of all cases, 98 were males and 42 were females, with a male-to-female ratio of 2.33 ∶ 1. The age distribution showed that 39.29% (55/140) of the cases were infants under 3 years, with peak age of disease onset under 1. Children and famers were at a high risk of kala-azar, accounting for 41.13% (58/140) and 28.37% (40/140), respectively. The majority of cases were residents in villages (85.00%, 119/140).Conclusion The epidemic of kala-azar in Shanxi Province shows a noticeable increasing trend, is rising with the affected areas being expanded year by year; new endemic areas continuously occurred, and reemergence appeared in some areas. The incidence shows an obvious regional distribution pattern.
Key words： Kala-azar; Epidemiological characteristics; Analysis; Shanxi
Yu-hua ZHENG , Yong-fei BAI , Ping TIE , Chang-fu YAN , Ting WANG , Jing-ying WANG , San-tao WANG , Jian CAI . Epidemiological characteristics of visceral leishmaniasis in Shanxi Province, 2010—2019[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2021 , 39(3) : 352 -358 . DOI: 10.12140/j.issn.1000-7423.2021.03.009
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