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infectious disease - disease caused by pathogens that can be passed from one organism to another, microorganism - organisms that are usually single-celled and can only be seen using a microscope . They include bacteria, fungi, viruses and protists, pathogens - microorganisms that cause disease, STD - transmitted from an infected person to an uninfected person by unprotected sexual contact, virus - pathogens that are much smaller than bacteria and can only reproduce inside living cells of other organisms, protist - single celled organism that causes malaria, bacteria - single celled microorganism that are sometimes useful sometimes harmful to humans and plants, aphids - insects that penetrate the plant phloem and feed on the dissolved food. They act as plant pathogens and are also vectors that carry pathogenic viruses, bacteria, and fungi into healthy plant tissue, vaccine - dead or inactive pathogenic material used in vaccination to develop immunity to a disease in a healthy person, antibodies - specific chemical produced by white blood cells to kill a pathogen, antitoxin - chemical produced by white blood cells to counter toxins released by bacteria,

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