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Infectious Disease. Aka Communicable Diseases. Caused by micro-organisms. Parasite – lives in/on and feeds on host.
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Immune System: a group of cells, tissues, and organs that fight disease; Lymphocytes: white blood cells that attack pathogens; Antibodies: chemicals produced specifically to fight a particular...
4 Pathogens Pathogen: disease causing microorganisms, molecules, and viruses. Animation 5 Pathogens Virus : a small pathogen that can only replicate itself inside of the living cells of other...
An infection is the invasion of the body’s tissues by microorganisms such as bacteria and viruses. These disease-causing agents produce reactions in their host as the immune system fights the microorganisms and the toxins they produce. A cold is a type of viral infection.
Infectious diseases can be caused by several different classes of pathogenic organisms (commonly called germs). These are viruses, bacteria, protozoa, and fungi. Almost all of these organisms are microscopic in size and are often referred to as microbes or microorganisms.