 [ Symptoms ] how can i know if my coldflu has become bacterial so i can take a ampicillin  i am aware that ampicillin does nothing if my coldflu is a virus but i have been sick for a week now and although my body is not soreweak anymore i still cough up alot of mucus and coughing hurts my chest a bit and i have a sore throat also runny nose with alot of mucus as well [ Disease ] one should have an indication of infection by the color of the mucus i e clearwhite to yellow to green green being a sign of probable sinusbronchial infection