Went to doctor, no streap, no mono, no flu. have fever (taking 600 mg of ibuprofen every six hours for that.) sore throat, tonsils feel dry and sore?

"unlisted" virus: Ok, it is not one of the more common, "testable" infections. So it is one of the thousands of "cold" viruses or other infections that is not routinely tested for. Your symptoms should be managed and if not improving in 2-4 days, should get re-checked to be sure do not need an antibiotic, steroid, or other intervention. Hydrate, rest, and treat symptoms in mean time.