Health experts are worried that a new, more virulent strain may be to blame.
卫生专家担心这归咎于一种毒力更强的新菌种。
Primary study on dog experimental infection by a virulent strain of canine adenovirus type1
犬1型腺病毒强毒株对犬得实验感染初步研究
Establishment of colloidal gold immune chromatographic assay for detection of hog choleras attenuated and virulent strain virus antibody
利用胶体金免疫层析法检测猪瘟强，弱毒抗体方法的建立
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