Hard to guess: Depends on details and severity. Cold or flu symptoms can be from cold viruses, strep throat, allergies, etc., except that allergies usually don't cause fever. Doctors have rapid 5-minute tests for strep, so a primary care doctor can diagnose strep and start antibiotics, often within the first few days of a strep throat infection. Doctors also have a 15-minute rapid test for Flu A and Flu B.
Answered 1/12/2020
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