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Pathogenic Organisms
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What does pathogen mean?
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Etymology Let’s break down the word into its roots patho – greek word pathos meaning suffering or disease gen – greek word genes meaning to be born or produced
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Pathogen a Definition A disease causing microorganism
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What are some types of pathogen? Think, pair, share -
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Bacteria Single celled organisms that lack a nucleus Because they have no nucleus we call them prokaryotes Classified as kingdoms Eubacteria and Archaebacteria Can cause many diseases including salmonella, pneumonia, tetanus, and plague
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Anthrax Bacteria Bacillus anthracis Source: http://www.bact.wisc.edu/Bact330/lectureanthraxhttp://www.bact.wisc.edu/Bact330/lectureanthrax Source: CDC with white blood cells
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Streptococcus pyogenes “flesh eating bacteria” http://img.medscape.com/pi/emed/ckb/infectious_diseases/211212-1641790-225243-1608843.jpg
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Fungi Multicellular with a nucleus, heterotrophs (consume other organisms for food) with cell walls containing chitin This kingdom includes mushrooms, molds, mildew, and yeas Diseases such as athletes foot, pneumonia, or meningitis
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Aspergillus fumigatus Source: Chiba Univ., Japan
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Protozoans Single celled organisms with a nucleus – may be photosynthetic or heterotrophic Classified as the kingdom Protista Can cause diseases such as giardiasis and cryptosporidium
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Giardia lamblia http://www.tulane.edu/~wiser/protozoology/notes/intes.html
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Virus Very small particle of genetic material and proteins reproduces inside the cells of a host organism 100 times smaller than bacteria Cause diseases such as ebola, flu, mumps, measles, and rabies
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Viruses Papillomavirus Influenza Hepatitis B http://web.uct.ac.za/depts/mmi/stannard/emimages.html
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