<a href=https://explorable.com/cause-and-effect>Establishing Cause and Effect</a>. Cause and effect is one of the most commonly misunderstood concepts in science and is often misused by lawyers, the media, politicians and even scientists themselves, in an attempt to add legitimacy to research.
You can't catch cancer from anyone, in any way. Cancer is not contagious. You can't catch HIV/AIDS just by touching somebody. The AIDS virus is not found in sweat. Yes, you can catch a cold, or the flu by shaking hands with someone if you then put your hands on/near a mucous membrane (eyes, nose, mouth).
Protozoa can be responsible for infectious diseases. Contaminated water can easily spread microoganisms that cause infection disease. Infectious diseases are considered communicable, and can be transmitted from one person to another. Properly washing hands can help prevent the spread of infectious diseases.any of these diseases make the body vulnerable to secondary infections, in which other organisms move in to take advantage of a weakened immune system, and this can be very problematic. Ad. The study of infectious disease is known as epidemiology.