My Father has fever for 11 days, on the thurd day he was relatively well, and he got vaccinated (flu vaccine) but since then his fever is not dropping (100° F) om the 5th day he developed cough and chest congestion, we got him an RAT, rtPCR for covid but both are negative, then we opted for a chest Xray but the X ray was clear, meanwhile we performed several other test like LFT , KFT , Uric acid, Urine examination all are normal except LFT (Raised ALT AST because of Fatty Liver) His condition is not improving.