live bacteria; viable microorganism
Used in scientific, medical, and food contexts to refer to living bacteria, viruses, or fungi, as opposed to dead or inactivated ones.
Yogurt contains live bacteria.
この消毒剤は生菌を99.9%除去します。
This disinfectant removes 99.9% of live bacteria.
live vaccine
Compound of 生 (sei, 'living') and 菌 (kin, 'bacteria/fungus'). The reading is on'yomi.