这个词是什么意思？
A species of CORONAVIRUS causing pneumonia in newborn rats but a clinically inapparent infection in adults. It is separate but antigenically related to MURINE HEPATITIS VIRUS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D017941 · MeSH 2026。
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