Yersinia enterocolitica O9 as a Possible Barrier Against Y. pestis in Natural Plague Foci in Ningxia, China |
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Authors: | Hiroshi Fukushima Qiong Hao Keli Wu Xiong Hu Jiehua Chen Zaifeng Guo Haixiang Dai Changyu Qin Shidang Lu Manabu Gomyoda |
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Institution: | (1) Shimane Prefectural Institute of Public Health and Environmental Science, 582-1 Nishihamasada, Matsue, Shimane 690-0122, Japan, JP;(2) Sanitation and Antiepidemic Station of Ningxia, China, CN;(3) Institute for Endemic Disease Prevention and Cure, Ningxia, Yinchuan, China, CN |
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Abstract: | A survey of Yersinia spp, as related to plague control, was made in Haiyuan of Ganning loess plateau plague focus, Yanchi of Inner Mongolia plateau
plague focus, and Yinchuan city, as a control area, in Ningxia, China. In Haiyuan, where the main plague reservoir was Mongolian
ground squirrel (Citellus alaschanicus) living in the prairie, Y. enterocolitica O9 was frequently isolated from pigs, dogs, rodents living in and around houses, but only rarely from hare and Mongolian
ground squirrel. In Yanchi, where the main plague reservoir was Mongolian gerbil (Meriones unguiculatus) living in the prairie and Y. pestis, which was isolated from rodents up to 1991, Y. enterocolitica O9 was sometimes isolated from pigs and rodents. In all areas, some strains of Y. enterocolitica O3 and Y. pseudotuberculosis serotypes 3 and 4b were also isolated from pigs, dogs, and from rodents. We propose that an epidemiological link exists between
the prevalence of Y. pestis and Y. enterocolitica O9 in domestic and rodents living in these areas in China. The residential area in Haiyuan may be protected against Y. pestis by the domestic animals and rodents which acquired cross-protection against Y. pestis by infection with Y. enterocolitica O9, but this is not the case in the Yanchi district.
Received: 14 February 2000 / Accepted: 17 July 2000 |
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