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microbes and disease

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  • 1. Microbes and disease
  • 2. microorganisms
    • Pathogens (cause disease)
    • Microscopic
      • Bacteria (cause cholera, boils, MRSA,TB,typhoid)
      • Viruses (cause warts,polio,flu,mumps,measles)
      • Fungi (cause athletes foot, ringworm)
    • Parasites also cause disease but these are not microorganisms ( eg fleas, worms)
  • 3. Important scientists in this area
    • Ignaz Semmelweiss – noticed that when doctors washed their hands fewer women died giving birth
    • Louis Pasteur – proved germs in air caused disease
    • Joseph Lister – developed carbolic soap and ensured surgeons and their instruments were cleaned before operations
  • 4. Cleaning chemicals
    • Disinfectants - for surfaces
    • Antiseptics - for wounds/sores
    • Why cleaning is important – good hygiene removes dirt/grease that pathogens stick to and use as a source of energy to multiply
  • 5. Protection against disease
    • Skin - barrier
    • Blood clots and scabs
    • Tears
    • Hairs in nose filter dirt
    • Mucus in nose and bronchi sticks to dirt/dust
    • Acid in stomach kills microbes
    • White blood cells – ingest microbes/make antibodies
    • Vaccination – with weak/dead microbe to make antibodies
    • Antibiotics – drugs to kill bacteria
  • 6. homework
    • Read p38-9 about drug development
    • Find out about the drug trials that went wrong at northwick park hospital in North London
    • Revise the whole topic ( first chapter in your text book)
    • Practise tests next week