SUMMARYWe’ve all caught some kind of infection, or sickness, from someone else. These illnesses are known as communicable or contagious diseases because they are spread from one person to another. They might occur when a healthy person becomes infected through contact with a sick person or by touching something that a sick person has come in contact with. Communicable diseases are caused by germs—both viruses and bacteria—and some examples include colds, flu, and strep throat. You can catch infe
