Objective To investigate host animals in new plague foci with a new outbreak in 2016 and vicinal regions in the plague foci of Rattus tanezumi in Jinghong, Yunnan Province, China, and to determine the epidemic situation and risk of plague among animals, so as to provide a basis for plague monitoring, prevention, and control in this area. Methods An investigation was carried out on host animals and vectors in the plague foci in Puwen Town and Dadugang Township, Jinghong City in September 2022. Bacteriological, serological, and molecular biological laboratory tests were conducted on the visceral organs, serums, and parasitic fleas of small mammals captured and collected. Results A total of 61 small mammals were obtained, which belonged to 7 species from 4 genera, 3 families, and 2 orders. R. tanezumi accounted for 79.66% and was the dominant species. A total of 35 parasitic fleas were collected on the body surface of small mammals, all of which were Xenopsylla cheopis. The flea index ranged from 1.00 to 2.00 in the residential area and from 0.00 to 0.38 in the wild area. Of 119 samples (induding 2 samples for reverse indirect hemagglutination assay) for testing serologically, 61 small mammal samples and 35 flea samples for testing bacteriologically, and 4 DNA samples from small mammals detected by quantitative real-time polymerase chain reaction, two F1 antibody-positive serum samples of R. tanezumi were detected. No Yersinia pestis was isolated and no specific gene fragment of Y. pestis was detected. Conclusions Main host animals and vector fleas of plague are widely distributed in Puwen Town and vicinal regions in Jinghong, and the capture rate of host animals and their flea index are relatively high in some areas, indicating an epidemic risk of plague. It is suggested that preventive rodent and flea control should be carried out in time in areas with high capture rate of host animals and flea index, and continuous plague monitoring should be strengthened to prevent the occurrence of human plague.
PU En-nian, XU Ding-cong, SU Chao, SU Li-qiong, DUAN Biao, YA Hong-xiang, REN Jian-nan, ZOU Jian-hong, TAN Li-tao, GAO Zi-hou
. Investigation and epidemic risk analysis of new plague foci and vicinal regions in Jinghong, Yunnan Province, China[J]. Chinese Journal of Vector Biology and Control, 2024
, 35(6)
: 687
-691
.
DOI: 10.11853/j.issn.1003.8280.2024.06.011
[1] 从显斌, 刘振才, 李群. 中国鼠疫自然疫源地(1950-2014)[M]. 北京:人民卫生出版社, 2019:973-974. Cong XB, Liu ZC, Li Q. Natural plague foci in China(1950- 2014)[M]. Beijing:People's Medical Publishing House, 2019:973-974.(in Chinese)
[2] 申剑波, 许云桥, 范建华. 云南省西双版纳州1992-2011年家鼠鼠疫流行病学分析[J]. 医学动物防制, 2012, 28(6):617- 619. DOI:10.3969/j.issn.1003-6245.2012.06.009. Shen JB, Xu YQ, Fan JH. Epidemiological analysis of the house rat plague during 1992 to 2011 in Xishuangbanna[J]. J Med Pest Control, 2012, 28(6):617-619. DOI:10.3969/j. issn. 1003- 6245.2012.06.009(. in Chinese)
[3] 石丽媛, 杨桂荣, 赵春花, 等. 2016年云南省景洪市一起人间鼠疫疫情判定及处置[J]. 中国卫生检验杂志, 2017, 27(10):1502-1504, 1507. Shi LY, Yang GR, Zhao CH, et al. Determination and disposal of human plague in Jinghong, Yunnan Province, in 2016[J]. Chin J Health Lab Tec, 2017, 27(10):1502-1504, 1507.(in Chinese)
[4] 魏辅文, 杨奇森, 吴毅, 等. 中国兽类名录(2021版)[J]. 兽类学报, 2021, 41(5):487-501. DOI:10.16829/j.slxb.150595. Wei FW, Yang QS, Wu Y, et al. Catalogue of mammals in China (2021)[J]. Acta Theriol Sin, 2021, 41(5):487-501. DOI:10.16829/j.slxb.150595(. in Chinese)
[5] 徐兴军, 吕建伟, 谢振丽, 等. 寒温带牧林交错区生境复杂度对啮齿类物种多样性的影响[J]. 生态学报, 2009, 29(6):2945-2952. DOI:10.3321/j.issn:1000-0933.2009.06.022. Xu XJ, Lyu JW, Xie ZL, et al. Effects of habitat complexity on species diversity of small mammals in pastures and forest interlaced regions[J]. Acta Ecol Sin, 2009, 29(6):2945-2952. DOI:10.3321/j.issn:1000-0933.2009.06.022(. in Chinese)
[6] 李紫薇, 尹家祥. 鼠类与环境因素和人类活动的关系[J]. 中国媒介生物学及控制杂志, 2023, 34(1):117-121. DOI:10.11853/j.issn.1003.8280.2023.01.022. Li ZW, Yin JX. The relationship between rodents and environmental factors and human activities[J]. Chin J Vector Biol Control, 2023, 34(1):117-121. DOI:10.11853/j. issn.1003.8280.2023.01.022(. in Chinese)
[7] 刘起勇. 气候变化对中国媒介生物传染病的影响及应对:重大研究发现及未来研究建议[J]. 中国媒介生物学及控制杂志, 2021, 32(1):1-11. DOI:10.11853/j.issn.1003.8280.2021.01.001. Liu QY. Impact of climate change on vector-borne diseases and related response strategies in China:Major research findings and recommendations for future research[J]. Chin J Vector Biol Control, 2021, 32(1):1-11. DOI:10.11853/j. issn. 1003.8280.2021.01.001. (in Chinese)
[8] Wang X, Wei XY, Song ZZ, et al. Mechanism study on a plague outbreak driven by the construction of a large reservoir in southwest China(surveillance from 2000-2015)[J]. PLoS Negl Trop Dis, 2017, 11(3):e0005425. DOI:10.1371/journal. pntd.0005425.
[9] 秦婧靓, 杨瑞馥, 崔玉军. 动物鼠疫周期流行的生态位影响因素研究进展[J]. 中国人兽共患病学报, 2021, 37(6):556-562. DOI:10.3969/j.issn.1002-2694.2021.00.025. Qin JL, Yang RF, Cui YJ. Research progress on factors in affecting periodic plague epizootics in plague niche[J]. Chin J Zoonoses, 2021, 37(6):556-562. DOI:10.3969/j. issn. 1002- 2694.2021.00.025(. in Chinese)
[10] 高少坤, 史献明, 杜国义. 河北省鼠疫自然疫源地动物鼠疫流行静息期探讨[J]. 中国媒介生物学及控制杂志, 2018, 29(2):191-193. DOI:10.11853/j.issn.1003.8280.2018.02.020. Gao SK, Shi XM, Du GY. Study on interictal period for animal plague foci in Hebei Province[J]. Chin J Vector Biol Control, 2018, 29(2):191-193. DOI:10.11853/j. issn. 1003.8280.2018.02.020. (in Chinese)
[11] 杨红梅, 王宇, 来明月, 等. 云南省西双版纳州2016-2020年 鼠疫宿主动物和媒介昆虫监测结果分析[J]. 现代预防医学, 2022, 49(5):927-930, 935. Yang HM, Wang Y, Lai MY, et al. Plague surveillance results in Xishuangbanna Prefecture, 2016-2020[J]. Mod Prev Med, 2022, 49(5):927-930, 935.(in Chinese)
[12] 李天元. 黄胸鼠实验感染鼠疫的抗体动态观察[J]. 中国地方病防治杂志, 1991(1):24-26. Li TY. Dynamic observation of antibody against plague by experimental infection of Rattus tanezumi[J]. Chin J Control Endemic Dis, 1991(1):24-26.(in Chinese)
