Environmental Science 15th Edition by Scott Spoolman,Tyler Miller

تمرين 19

What is the key concept for this section? Define infectious disease ; define and distinguish among bacteria , viruses , and parasites ; and give examples of diseases that each can cause. Define and distinguish between transmissible disease and nontransmissible disease , and give an example of each. List four ways in which infectious organisms can enter the body. In terms of death rates, what are the world's four most serious infectious diseases? List five factors that have contributed to genetic resistance in bacteria to commonly used antibiotics. What is MRSA and why is it so threatening?