<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).
Failure to adequately wash hands is a major cause of infectious diseases. Individuals who practice poor personal hygiene while preparing food may spread diseases such as hepatitis A, salmonellosis, and shigellosis. Studies indicate that onethird (33%) of people do not wash their hands after using the restroom.