The little girl is running a fever and she needs help.

这个小女孩正在发烧，她需要帮助。

《柯林斯英汉双解大词典》

Seems like I'm running a fever.

我好像发烧了。

youdao

I feel as if I'm running a fever.

我好像有点儿发热。

《新英汉大辞典》

He was in the hospital, running a high fever and declining quickly.

VOA: standard.2010.01.12

Mr. Hazare had been running a fever for several days but vowed to go on with his fast.

WSJ: India Moves to Toughen Graft Fight

No one has reported sick so far, but five staff whose children are running a fever have been asked to work out of their homes.

FORBES: Market Scan

Their, misplaced, argument was that South Africa was a major centre of the epidemic - with infection rates running at about 11% nationally - whereas yellow fever had been eradicated in Nigeria.

BBC: African viewpoint: Yellow fever and family demands