Maryh--quit passing out bogus medical advise that sounds good to you. Neither yellow nor green have anything to do with bacterial infection. Increased phlegm, of any color, is almost always due to a viral (i.e. A cold) infection. Color is due more to hydration and white blood cell content, rather than bacterial infection. Antibiotics due absolutely nothing for a cold virus, except waste money, cause resistance, and possible drug side effects, which may be serious.
