Objective To investigate the barrier effect of rivers on the spread of rodent plague. Methods The data of the rodent plague foci in Dehong autonomous prefecture of Yunnan province, China, from January 1982 to December 2007 were collected. The numbers of townships and plague foci with rodent plague were recorded in each county (city) and in each of the three regions divided by the Daying River and Longchuan River (national borders-Daying River, Daying River- Longchuan River, and Longchuan River-prefecture borders) in each year. The epidemic intensity values of five counties (cities) and three regions were calculated according to the entropy index and adjusted for area size. The difference in adjusted epidemic intensity between the five counties (cities) or the three regions were analyzed using the Kruskal-Wallis H test. Results During 1982-2007, in Yingjiang, Lianghe, Longchuan, Ruili, and Mangshi, rodent plague was epidemic for 16, 11, 19, 11, and 10 years, respectively, and the numbers of plague foci were 159, 96, 93, 76, and 35, respectively. There was no significant difference in the overall distribution of adjusted epidemic intensity between the five counties (H=8.277, P=0.082). In the three regions (national borders-Daying River, Daying River-Longchuan River, and Longchuan River-prefecture borders), plague was epidemic for 16, 25, and 10 years, respectively, and the numbers of plague foci were 103, 321, and 35, respectively. There was a significant difference in the overall distribution of adjusted epidemic intensity between the three regions (H=19.738, P=0.000), and significant differences were also observed between the region from Longchuan River to Daying River and the region from national borders to Daying River or the region from Longchuan River to prefecture borders (χ2=18.423, P=0.003; χ2=26.692, P=0.000). Conclusion Rivers may have a barrier effect on the spread of rodent plague in Dehong prefecture, which may be related to the effects of rivers on the geographical distribution of Yersinia pestis and the community, population and distribution of the host and vector fleas of Y. pestis.
GE Jun-qi, LI Xue-yuan, GONG Zheng-da, MA Yong-kang, ZHANG Hong-jiang, HE Fu-rong, ZHANG Zheng
. Study on the barrier effect of rivers on the spread of rodent plague in Dehong prefecture of Yunnan province, China[J]. Chinese Journal of Vector Biology and Control, 2019
, 30(3)
: 268
-271
.
DOI: 10.11853/j.issn.1003.8280.2019.03.009
[1] Etherington TR. Geographical isolation and invasion ecology[J]. Prog Phys Geog Earth Environ,2015,39(6):697-710. DOI:10.1177/0309133315582046.
[2] Korva M,Knap N,Rus KR,et al. Phylogeographic diversity of pathogenic and non-pathogenic Hantaviruses in Slovenia[J]. Viruses,2013,5(12):3071-3087. DOI:10.3390/v5123071.
[3] Rees EE,Pond BA,Tinline RR,et al. Understanding effects of barriers on the spread and control of rabies[J]. Adv Virus Res,2011,79:421-447. DOI:10.1016/B978-0-12-387040-7.00020-2.
[4] Kim JA,Kim WK,No JS,et al. Genetic diversity and reassortment of Hantaan virus tripartite RNA genomes in nature,the republic of Korea[J]. PLoS Negl Trop Dis,2016,10(6):e0004650. DOI:10.1371/journal.pntd.0004650.
[5] 葛军旗,李镜辉,马永康,等. 基于信息熵的动物鼠疫流行强度定量化初探[J]. 中国媒介生物学及控制杂志,2018,29(5):439-441. DOI:10.11853/j.issn.1003.8280.2018.05.004.
[6] 熊俊杰. 三峡工程对坝区自然疫源性疾病影响的研究[D]. 武汉:华中科技大学,2008.
[7] 赵斌. 1991-2007年云南家鼠疫源地鼠疫监测及相关因素分析[D]. 长春:吉林大学,2008.
[8] 葛军旗,龚正达,栗冬梅,等. 云南香格里拉山地自然风景区蚤类多样性的研究[J]. 寄生虫与医学昆虫学报,2013,20(3):162-169. DOI:10.3969/j.issn.1005-0507.2013.03.005.
[9] 龚正达,吴厚永,段兴德,等. 云南横断山区蚤类物种丰富度与区系的垂直分布格局[J]. 生物多样性,2005,13(4):279-289. DOI:10.3321/j.issn:1005-0094.2005.04.001.
[10] Cabanel N,Leclercq A,Chenal-Francisque V,et al. Plague outbreak in Libya,2009,unrelated to plague in Algeria[J]. Emerg Infect Dis,2013,19(2):230-236. DOI:10.3201/eid1902. 121031.
