The patient's running a high fever.; The patient has a high temperature.

病人烧得厉害。

《新英汉大辞典》

Initial symptoms include a high fever, usually with a temperature higher than 38oC, and other influenza-like symptoms.

初期症状包括体温38度以上的高烧和其他流感样症状。

youdao

The small boy's misunderstanding of the difference in measuring temperature on a Fahrenheit and a Celsius scale causes him to believe that he is dying of a high fever.

那个小男孩误解了华氏度和摄氏度在测量温度时的标准不同，导致他相信他达到了接近死亡的高温。

youdao

The severe form of the disease, dengue haemorrhagic fever, involves a high temperature, head and muscle aches, internal bleeding and, at worst, circulatory failure.

ECONOMIST: Dengue fever, a man-made disease