yersinia enterocolitica o9 as a possible barrier against y. pestis in natural plague foci in ningxia, china.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 y ...200111116388
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