这个词是什么意思？
A subtype of INFLUENZA A VIRUS comprised of the surface proteins hemagglutinin 9 and neuraminidase 2. The H9N2 subtype usually infects domestic birds (POULTRY) but there have been some human infections reported.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D053127 · MeSH 2026。
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