One of the simplest ways to avoid contagion is to wash your hands. Vigourous handwashing remains the single most effective means of preventing the spread of infectious agents. Plain soap will suffice. Most anti-bacterial' soaps prevent bacteria from growing, but don't kill them. A few of these soaps may contain specific antibiotics but, then again, it is best to avoid antibiotics when they are not essential.
Soap does the job.
Don't pressure physicians to prescribe them. Over 50 percent of ear infections in children, for example, are caused by viruses, against which antibiotics are useless, except to develop drug resistance. A good clinician should make the diagnosis. Finish the entire, prescribed course of antibiotics. Many people stop taking their medicine after just a few days, when it has killed only the weakest microbes, and left the hearty ones to flourish.