An analysis of surveillance data on plague host animals and vector fleas in Wenzhou, Zhejiang Province, China, 2013-2022

LI Jiang-feng, CHEN Shuai

doi:10.11853/j.issn.1003.8280.2024.02.009

Chinese Journal of Vector Biology and Control >

2024 , Vol. 35 >Issue 2: 177 - 181

DOI: https://doi.org/10.11853/j.issn.1003.8280.2024.02.009

Vector Surveillance

An analysis of surveillance data on plague host animals and vector fleas in Wenzhou, Zhejiang Province, China, 2013-2022

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1. Institute for Disinfection & Vector Control, Wenzhou Center for Disease Control and Prevention, Wenzhou, Zhejiang 325001, China

Received date: 2023-11-01

Online published: 2024-05-09

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Abstract

Objective To analyze the changes in plague host animals and vector populations in Wenzhou, Zhejiang Province, China, so as to provide data support for plague prevention and control.Methods Descriptive epidemiological methods were used to analyze the distribution of plague hosts and vectors based on the surveillance data in Wenzhou from 2013 to 2022. The rates between groups were compared using the Chi-square test. The flea index distribution between groups was compared using the Kruskal-Wallis H test. The temporal trend of the flea index was determined using the Mann-Kendall trend test. The temporal trends of the flea infestation rate and small mammals capture rate were determined using the Cochran-Armitage trend test.Results From 2013 to 2022, a total of 37 851 small mammals were captured in Wenzhou, belonging to 15 species, 11 genera, 4 families, and 3 orders. The overall capture rate was 9.44 %. Suncus murinus (48.98 %), Rattus norvegicus (29.03 %), and R. tanezumi (9.32 %) were the dominant species. From 2013 to 2022, the capture rate of S. murinus showed an upward trend (Z=-27.408, P<0.001), while the capture rates of R. norvegicus and R. tanezumi showed a downward trend (both P<0.001). A total of 17 144 small mammals were combed, and fleas were detected in 629 small mammals (3.67 %). The total number of fleas collected was 1 962, and the flea index was 0.11. The flea infestation rate between different small mammals was significantly different (χ²=875.254, P<0.001). A total of 33 761 animals were dissected, and no Yersinia pestis was detected and all negative for a total of 36 958 serum samples.Conclusions Epizootic plague in Wenzhou is at a resting state, but the risk of plague spread remains existing. It is necessary to further strengthen plague surveillance and emergency preparedness and response.

Key words： Plague; Surveillance; Host animals; Vector fleas

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LI Jiang-feng, CHEN Shuai . An analysis of surveillance data on plague host animals and vector fleas in Wenzhou, Zhejiang Province, China, 2013-2022[J]. Chinese Journal of Vector Biology and Control, 2024 , 35(2) : 177 -181 . DOI: 10.11853/j.issn.1003.8280.2024.02.009

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