Hello doctor, my dad is having dry cough, fever(102F), headache, runny nose since 3 days. His doctor prescribed him amoxycillin500mg tds, and symptomatic medicines. it is 3rd day, he still has on and off fever but milder degree, cough and cold, weakness. i wanted to know is it the flu? do we need some investigation to be done? when canwe expect him to feel better?