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22 terms

Communicable Diseases, CH 17

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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