Hello, Faraz—and welcome to English Forums. Thank you for registering as a member. frazpk The person is suffering from fever from yesterday.
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frazpkThe person is suffering from fever from yesterday.If he still has a fever now, he would say:
frazpk1. I have fever since yesterday (is this correct?)No.
frazpk2. I have had fever since yesterday (this would definitely be correct)Yes, but natives make the noun countable: 'a fever'.