His passion was the key to his success.

He took a day off from school because he had a fever.

He has a fever because he caught a cold.

He is an ardent music lover.

I'm always moved by his passionate expressions of love.

He and she are in the midst of passionate love.

He is passionately in love with her.

After taking the antipyretic, my fever went down.

She gave medicine to bring down her child's fever.

My friend contracted Q fever.