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Direct Contact: usually when infected blood or other body fluids from one person enter another person's body. For instance, if you have a cut on your hand and touch blood from someone who is bleeding, diseases in that person's blood may enter your body.

Indirect Contact: when infected blood or other body fluids get onto an object, and from there enter another person's body. For instance, if a person with mononucleosis (commonly called "mono") drinks from a glass, infected saliva will remain on the glass. If a healthy person then drinks from the same glass without washing it, the infected saliva can enter the healthy person's body, infecting that person as well.

Airborne: a disease that can survive while floating through air. Active tuberculosis (TB) can be passed in this way. If a person with active TB coughs out the TB bacteria, and a healthy person breathes them in, that person can become infected as well.

Vector: a disease that is carried by another organism. For instance, the infamous Bubonic Plague (also called the "Black Death") was probably spread between humans by fleas. West Nile Virus is a more contemporary example, spread by mosquitoes.

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