这个词是什么意思？
A chronic, clinically mild, infectious pneumonia of PIGS caused by MYCOPLASMA HYOPNEUMONIAE. Ninety percent of swine herds worldwide are infected with this economically costly disease that primarily affects animals aged two to six months old. The disease can be associated with porcine respiratory disease complex. PASTEURELLA MULTOCIDA is often found as a secondary infection.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D045729 · MeSH 2026。
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