It's what you and I were never taught in school about the startling link between your body's intestinal flora and your ability to prevent serious illness, to add vital years to your life, and to enjoy a dramatically higher quality of life right now. Bacteria are the simplest, smallest, and most abundant organisms on the planet. One of their most important roles is decomposition. Without bacteria, organic carbon, found in dead and rotting organisms, would deplete the carbon dioxide in the atmosphere. Without carbon dioxide, photosynthesis could not occur and no food could grow.
Bacteria are also important for everyday functions of the body including digestion.
So, as you can see, bacteria are vital to human survival. Ever since Fleming's discovery, antibiotic use has flourished at an incredible rate. Four years after mass production of penicillin began, a frightening and unexpected phenomenon started to occur. Some of the deadly bacteria that the antibiotic was supposed to destroy began developing resistance. When in doubt, look at how Creation re-establishes colonies which have been wiped out by antibiotic treatments.