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communicable disease a disease that can be passed from person to person, animal, or object pathogens tiny organism that can cause communicable diseases infection a condition that occurs when when a pathogen enters the body bacteria tiny one-celled organisms that live nearly everywhere virus smallest disease containing organism fungi primitive life forms that feed on organic materials protozoa single celled-organisms that are usually harmless but can cause certain diseases rickettsias disease causing organisms that resemble bacteria but multiply like viruses vector an organism, such as an insect, that transmits a pathogen contagious period the length of time that a particular disease can spread from person to person Immune system a combination of body defenses made up of cells, tissues, and organs that fight off pathogens immunity your body's ability to resist germs that cause a particular disease lymphatic system secondary circulation system that helps the body fight pathogens and maintain its fluid balance antigens substances released by invading pathogens antibodies proteins that attach to antigens, keeping them from harming the body hepatitis disease of the liver characterized by yellowing of the skin and eyes mononucleosis viral disease whose symptoms include swollen, tender areas in the neck and a sore throat STDs infection spread from person to person through sexual contact AIDS deadly disease, that interferes with the body's natural ability to fight infection HIV Virus that causes AIDS carrier a person who appears healthy but is infected with HIV opportunistic infection an infection that rarely occurs in a healthy person