Microscopic germs (such as bacteria or viruses) enter the body and cause issues to cause infectious diseases.
Some infectious diseases, although not all, are transmitted directly from one person to another. Contagious diseases are infectious diseases that transmit from person to person.
Some infections are transmitted to humans by an animal or bug but are not transmitted by another human. Lyme disease is an example: you can't get it from someone you're friends with or someone you pass on the street. It is caused by the bite of an infected tick.
Contagious diseases (such as the flu or strep throat) spread in a variety of ways. One method is by direct physical contact, such as touching or kissing an infected individual.
Learn more about contagious diseases here,
https://brainly.com/question/13327723
# SPJ9
