THE USE OF ANTIBIOTICS

Bacteria are single-celled organisms usually found all over the inside and outside of our bodies, except in the blood and spinal fluid. Many bacteria are not harmful. In fact, some are actually beneficial. However, disease-causing bacteria trigger illnesses, such as strep throat and some ear infections. Viruses are even smaller than bacteria. Viruses are non-living organisms that cause disease by invading healthy host cells and reproducing. As virus particles multiply, the host cells burst, allowing the viruses to infect other cells. A virus cannot survive outside the body's cells. It causes illnesses by invading healthy cells and reproducing.