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extremely small unicellular organisms without a nucleus; prokaryotic cells


medicine that kills or slows the growth of bacteria


any disease-producing agent (especially a virus or bacterium or other microorganism)


substance that, when introduced into the body, causes formation of antibodies against it


a substance produced by the body that destroys or inactivates an antigen that has entered the body


A strand of nucleic acid encased in a protein coat that can infect cells and replicate within them


an organism, such as an insect, that transmits pathogens


acquired immunodeficiency syndrome


a eukaryotic organism that cannot be classified as an animal, plant, or fungus


solution made from dead viruses that is use to prevent viral disease


Resistance to disease


lymphocytes that develop in the thymus and are responsible for immunity

B cell

a white blood cell that matures in bones and makes antibodies

allergic response

when the immune system overreacts to an otherwise harmless substance

antibiotic resistance

when some bacteria are able to survive in the presence of an antibiotic

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