Bacterial and viral infections are caused by microbes (bacteria and viruses) respectively.

细菌感染和病毒感染分别是由细菌和病毒这两种微生物引起的。

Bacterial and viral infections can cause mild, moderate, and severe diseases.

细菌感染和病毒感染可以引起轻度、中度或严重的疾病。

Bacterial and viral infections can cause similar symptoms such as coughing, sneezing and fever.

细菌感染和病毒感染可引起类似的症状，例如咳嗽、打喷嚏和发烧。

来源：同文世纪翻译，转载请注明出处！