noun
good bacteria; beneficial bacteria
Commonly used in health and nutrition contexts, often contrasted with 悪玉菌 (bad bacteria).
See also: 悪玉菌
ヨーグルトには善玉菌が多く含まれている。
Yogurt contains a lot of good bacteria.
腸内の善玉菌
Increasing the good bacteria in your gut leads to better health.