1A slight fever; a mildly elevated body temperature, not a high fever, often accompanied by fatigue or minor discomfort.
彼は昨日から微熱があって、今日は休んでいる。
He's had a slight fever since yesterday and is off work today.
微熱が続くときは医師に相談したほうがいい。
If a slight fever continues, it's better to consult a doctor.
初期症状は咳と微熱だけだった。
The initial symptoms were only a cough and a slight fever.