I have an upper respiratory infection how long am i contagious ? doctor gave me an antibotic and prednisone do i need both ?

URI contagious: If you have a viral upper respiratory infection, two - three days. If you have a bacterial respiratory infection, which may follow the viral uri, generally this is not contagious. Bacterial infections generally follow the insult from the virus. Antibiotics will shorten the duration of a bacterial infection. Prednisone speeds up recovery quickest, but should be used with caution.