In patients with immune deficiencies, polyoma viruses can pose serious health threats.
在免疫功能缺陷的患者，多瘤病毒可对健康造成严重威胁。
Polyoma viruses previously have been named after the initials of the patient in whom they were first discovered.
此前多瘤病毒的名称来源于首次发现病毒感染的患者姓名缩写。
Other previously identified polyoma viruses are widespread in the general population, where they typically produce no symptoms.
其他以前确定的多瘤病毒普遍存在于一般民众，通常无症状。
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