作者: K. Keel , J. S. Brazier , K. W. Post , S. Weese , J. G. Songer
DOI: 10.1128/JCM.00224-07
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摘要: … were isolated not only from other species but also from other herds of pigs. Biosecurity … with no exposure to other species. The only factor common to both species is close contact …