There are three main ways that HIV can be transmitted to people: sexually, through blood, and from mother to child. AIDS is a blood-borne disease and cannot be transmitted through the air. Sexual transmission occurs when a person with AIDS has unprotected sex with a healthy person, during which the AIDS patient’s bodily fluids enter the healthy person’s body and cause the infection. Blood transmission is when a healthy person brings blood from an AIDS patient into his or her body in some way, thus causing the transmission of AIDS. Mother-to-child transmission is when a mother with AIDS transmits HIV to her baby during pregnancy or after giving birth by breastfeeding.