Dear doctor, I get cough & cold (sometimes fever also) almost every month. And it doesn't cure until I take antibiotics (usually for 5 days). I don't self medicate, however, every time I do try to resolve the problem by salt water gargle & steam. But mostly I HAVE to take the antibiotics. Please suggest me ways to increase body's natural immunity to fight infection. Or, if possible, some solution to avoid antibiotics. Thank you