Objective To analyze the epizootic trend of animal plague in the natural plague foci of Hebei province, China, and to provide evidence for formulating the strategies for the prevention and control of plague in Hebei province. Methods The monitoring data of animal plague in the natural plague foci of Hebei province from 1950 to 2019 were analyzed using Excel 2007 and SPSS 19.0 softwares. The number of Yersinia pestis positive animals was described as constituent ratio. The distribution of different groups was compared by the χ2 test. The seasonal distribution of animal plague was analyzed by concentration degree. Results The median interval of plague epizootics in the natural plague foci of Hebei province was 9.5 years. The epizootics had certain seasonality (M=0.387), with a high frequency during October to November and then during April to May. Kangbao pasture (constituent ratio 73.13%) and Zhaoyanghe town (constituent ratio 26.12%) were the main epizootic areas. Meriones unguiculatus (constituent ratio 87.31%) was the main animal involved in the epizootics. The main vectors were Nosopsyllus laeviceps kuzenkovi (constituent ratio 1.49%) and Citellophilus tesquorum mongolicus (constituent ratio 1.49%). Among positive rodents, 92.25% were naturally dead rodents. The number of Y. pestis strains isolated from M. unguiculatus was significantly different between five rounds of plague epizootics (χ2=20.026, P<0.001). The average density of M. unguiculatus was 1.98/hm2, the average flea index of body fleas was 1.12, and the average flea index of nest fleas was 3.19. Conclusion Plague epizootics in the natural plague foci of Hebei province show intermittent and relatively stable characteristics. In order to reduce the risk of animal plague, close attention should be paid to the density and parasitic flea index of M. unguiculatus, and measures should be taken timely to kill rodents and fleas in spring and autumn. At the same time, the searching for naturally dead rodents in historical epizootic areas should be strengthened to discover plague epizootics in time and prevent the spread of plague.
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