一种已知或合理预期含有病原体的物质，如细菌、病毒、立克次体、寄生虫、真菌或朊病毒，可导致人类或动物疾病。培养物：含有有意传播的病原体的传染性物质。

A material known or reasonably expected to contain a pathogen, such as bacteria, viruses, rickettsiae, parasites, fungi or prions, that can cause disease in humans or animals. Culture: An infectious substance containing a pathogen that is intentionally propagated.