CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES >

2023 , Vol. 41 >Issue 5: 579 - 585

DOI: https://doi.org/10.12140/j.issn.1000-7423.2023.05.009

ORIGINAL ARTICLES

The epidemiological characteristics of visceral leishmaniasis in Longnan City from 2005 to 2021

  • WANG Xiaojun ,
  • CAI Yucheng ,
  • ZOU Xuan ,
  • LI Hui ,
  • TONG Bobo
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  • Longnan Center for Diseases Control and Prevention, Longnan 746000, Gansu, China

Received date: 2023-02-14

  Revised date: 2023-05-31

  Online published: 2023-11-06

Supported by

National Science and Technology Major Project of China(2017ZX10103006)

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Abstract

Objective To analyze the epidemiological characteristics of visceral leishmaniasis cases in Longnan City, Gansu Province from 2005 to 2021, to provide scientific basis for formulating prevention and control strategy for visceral leishmaniasis. Methods The information on the visceral leishmaniasis cases residing at the current address in Longnan City, reported by the National Infectious Disease Surveillance Reporting and Management System from 2005 to 2021, was collected. A database was established using Microsoft Excel 2013. Three-dimentional distribution characteristics of visceral leishmaniasis cases were analyzed with descriptive epidemiological method. The distribution map of reported cases was plotted by Arc GIS 10.2. Statistical analysis was performed using SPSS 25.0 software. Results From 2005 to 2021, a total of 1 109 cases of visceral leishmaniasis were reported in Longnan City,among them, 577 cases were of clinical diagnosis, and 532 confirmed cases. The annual average incidence rate was reported at 2.49/100 000, showing a low prevalence status. The incidence rate reached 2.76/100 000 in 2005, rose to 4.53/100 000 in 2009, and gradually dropped to 0.46/100 000 in 2021, indicating a trend of first increase and then decrease (χ2 = 267.561, P < 0.01). The visceral leishmaniasis cases were mainly distributed in Wudu District (606 cases), Wenxian County (323 cases) and Tanchang County (148 cases), accounting for 97.11% of reported cases (1 077/1 109). In some villages/towns of endemic counties, a cluster of high incidence was found. There were 633 male cases and 476 female cases, and the sex ratio was 1.33∶1; the incidence rates in males and females were 2.73/100 000 and 2.23/100 000, respectively (χ2 = 2.699, P > 0.05). The number of reported cases in the 0-4 age group accounted for 50.50% (560/1 109) of the total number of reported cases, with the highest incidence rate of 19.62/100 000. The second is the 5-9 age group, with the number of reported cases accounting for 12.80% (142/1 109) of the total number of reported cases, and the incidence rate is 4.84/100 000. It indicated that the incidence rate tends to decrease with age (χ2 = 14.942, P < 0.01). The first incidence rate was occupied in children of scattered living, accounting for 41.12% (456/1 109), and the second in peasants, accounting for 24.71% (274/1 109). Conclusion In Longnan City of Gansu Province, visceral leishmaniasis remains at a low prevalent status. The reported cases are mainly of children. There is a recurgence trend in historically endemic counties.

Key words： Visceral leishmaniasis; Incidence trend; Epidemiological characteristics

Cite this article

WANG Xiaojun , CAI Yucheng , ZOU Xuan , LI Hui , TONG Bobo . The epidemiological characteristics of visceral leishmaniasis in Longnan City from 2005 to 2021[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2023 , 41(5) : 579 -585 . DOI: 10.12140/j.issn.1000-7423.2023.05.009

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