theory that states that diseases are caused by microscopic particles called pathogens
agent that causes disease
organism, such as a mosquito or tick, that transfers pathogens from one host to another
body system that fights off infections
cell that destroys other cells by surrounding and engulfing them
white blood cell that matures in the thymus and destroying infected body cells by causing them to burst; also called a T-lymphocyte
white blood cell that matures in the bone marrow and produce antibodies that fight off infection; also called B-lymphocyte
protein produced by B cells that aids in the destructio of pathogens
type of protein, produced by body cells, that prevents viruses from replicating in infected cells
immunity that occurs without the body undergoing an immune response
immunity that occurs after the body responds to an anitgen
immune response that is characterized by swelling, redness, pain, and itching
protein marker that helps the immune system identify foreign particles
chemical, such as soap, vinegar, or rubbing alcohol, that destroys pathogens outside the body
process by which bacteria mutate so that they are no longer affected by an antibiotic
immune response that occurs when the body responds to a nondisease-causing antigen, such as pollen or animal dander
antigen that does not cause disease but still produces an immune response
severe allegic reaction that causes airways to tighten and blood vessels to leak
human immunodeficiency virus (HIV)
acquired immune deficiency syndrome (AIDS)
condition characterized by having several infections and very few T-cells; caused by HIV
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