Humans are complex multicellular organisms, but we are not alone. Our body provides various habitats to trillions of bacteria. Scientists estimate that humans carry 10 times more bacteria than the number of the cells you are made of. The PBS video The Invisible Universe introduces the concept of microbiome and explains why we need bacteria to be healthy (click here Word Document for a transcript of this video). However, do not be fooled by these friendly bacteria as many have the potential to make you sick. Read the article Stop the Spread of Superbugs: Help Fight Drug-Resistant Bacteria and explain:
Human cells remain unaffected by bacteria because they do not produce or need peptidoglycan. Antibiotics often function as chemicals targeting prokaryotic cells but have no impact on the eukaryotic ones. These antibiotics often function as natural chemicals produced by bacteria and fungi to control their bacterial competitors. The resistance of antibiotics occurs when bacteria mutate and adapt making them invulnerable to drugs used to treat infections they cause. The overuse of antibiotics exacerbates the development of superbugs.