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The Good, the Bad, and the UGLY

The Good, the Bad, and the UGLY. Helpful and Harmful Bacteria. Harmful Bacteria. some bacteria cause diseases Animals can pass diseases to humans Communicable Disease – Disease passed from one organism to another This can happen in several ways: Air

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The Good, the Bad, and the UGLY

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  1. The Good, the Bad, and the UGLY Helpful and Harmful Bacteria

  2. Harmful Bacteria • some bacteria cause diseases • Animals can pass diseases to humans • Communicable Disease – • Disease passed from one organism to another • This can happen in several ways: • Air • Touching clothing, food, silverware, or toothbrush • Drinking water or eating food that contains bacteria

  3. Streptococcus pyogenes

  4. Meningitis • Infection of the spinal fluid and membranes surrounding the brain. • Initially caused by Haemophilus influenzae B. Now, however, with the advent of the HiB vaccinne, Streptococcus pneumoniae or Neisseria meningitidis cause most cases of Meningitis. • Transmitted via direct contact with respiratory secretions of infected individuals. • Symptoms include fever, headache, and stiff neck. www.co.monroe.mi.us/.../default.aspx?PageId=605

  5. Escherichia Coli • Normally lives in your intestines and helps you to digest the food you eat. • The “bad” E. coli are certain strains of bacteria that travel from the intestines into the blood of organisms. • Symptoms of E. coli infection include fever, vomiting, diarrhea, and cramping. www.astrographics.com/cgi-bin/ase/ase.cgi?aff...

  6. Propionibacterium acnes • Present on most people’s skin and lives off of fatty acids in the sebaceous glands. • When a pore is blocked this anaerobic bacteria overgrows and secretes chemicals that break down the wall of the pore, spilling bacteria such as Staphylococcus aureus into the skin, and forming an acne lesion (folliculitis)

  7. Syphilis www.wales.nhs.uk/sites3/page.cfm?orgId=719... • Sexually transmitted infection caused by bacteria Treponema pallidum. Several levels of infection (primary, secondary, latent, tertiary). • Symptoms include a sore (chancre), rash, damage to vital organs, paralysis, dementia, blindness etc. • Can be treated with antibiotics

  8. Harmful Bacteria Bacteria that cause cavities use the sugar present on the tooth’s surface for energy. In turn, the bacteria secretes acid that erodes the surface of the tooth. Human tooth with accumulation of bacterial plaque (smooth areas) and calcified tartar (rough areas).

  9. Helpful Bacteria • Decomposers help recycle nutrients into the soil for other organisms to grow • Bacteria grow in the stomach of a cow to break down grass and hay • Most are used to make antibiotics • Streptomycin, bacitracin, tetracycline, and vancomycin • Some bacteria help make chocolate and vitamins • Used to break down the covering of cocoa beans during production of cocoa • Used to make industrial chemicals

  10. Helpful Bacteria E.coli on small intestines

  11. Helpful Bacteria • Used to treat sewage • Organic waste is consumed by the bacteria, used as nutrients by the bacteria, and is no longer present to produce odors, sludge, pollution, or unsightly mess. • foods like yogurt, cottage & Swiss cheese, sour cream, buttermilk are made from bacteria that grows in milk • giving them taste • and texture

  12. Controlling Bacteria 3 ways to control bacteria: 1) Canning-the process of sealing food in airtight cans or jars after killing bacteria • endospores are killed during this process 2) Pasteurization-process of heating milk to kill harmful bacteria 3) Dehydration-removing water from food • Bacteria can’t grow when H2O is removed • example: uncooked noodles & cold cereal

  13. Controlling Bacteria Antiseptic vs. Disinfectants Antiseptic- chemicals that kill bacteria on living things • means – “against infection” Examples: iodine, hydrogen peroxide, alcohol, soap, mouthwash Disinfectants- stronger chemicals that destroy bacteria on objects or nonliving things

  14. The Bad Side of Antibiotics • Most do not know the difference between good and bad bacteria. • Non-discriminating action of antibiotics leads to a significant lowering of the natural, good bacteria in the human body. Can result in other health complications.

  15. What doesn’t kill them….. • Antibiotic resistance – bacteria are not killed when exposed to antibiotics. • BIG problem • Improper use and abuse of antibiotics • Antibiotics should only be prescribed (when needed) for bacterial infections, not viral infections. • Video clip of antibiotic resistance evolving: http://www.pbs.org/wgbh/evolution/library/10/4/l_104_03.html

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