7. Key Concept How do bacteria cause disease? Bacteria produce disease in one of two general ways. Some bacteria damage the cells and tissues of the infected organism directly by breaking down the cells for food. Other bacteria release toxins that travel throughout the body interfering with the normal activity of the host.
8. Key Concept How can bacterial growth be controlled? There are various methods used to control bacteria growth, including sterilization, disinfectants, and food processing.
9. Key Concept How do viruses caused disease? Like bacteria, viruses produce disease by disrupting the body’s normal equilibrium.
