He has a high fever. Aspirin should help reduce the fever. The fever means the fever that has just been mentioned.
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He has a high fever.
Aspirin should help reduce the fever.
The fever means the fever that has just been mentioned. It is not uncountable.
Hmm. We say
eg He has a fever, a cough, a cold, a headache, a stomache.
eg He has measles, cancer, diabetes.
eg He has the flu.