Fighting Disease

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  • Disease
    • Types
      • Bacteria- very small, they damage your cells and produce toxins
      • Virus- not cells, replicate in your cells, cell bursts and this damage makes you feel ill
    • Defense System
      • Skin, plus hair and mucus in respiratory tract
      • Platelets help blood clot from a wound
      • If all fails- Immune System- White Blood Cells
        • Engulf and Digest
        • Antibodies attack the microbe- immunity if infected again
        • Antitoxins- Bacteria
    • Vaccination
      • Dead/inactive microorganisms- carry antigens
      • Weakened versions
      • Measles, Mumps, Rubella
      • Pros
        • Conrol infectious Disease- Smallpox
        • Epidemics can be prevented if a large % are vaccinated
      • Cons
        • Sometimes don't give you immunity
        • Bad reaction
    • Drugs
      • Painkillers relieve symptoms
      • Antibiotics kill/prevent growth of the bacteria
        • Don't kill viruses, as they use body's cells
        • Bacteria can mutate- resistant to an antibiotic
          • Survive and reproduce
      • Investigate in 'culture medium'- agar jelly
    • Past and Future
      • Semmelweis- antiseptic solution
      • Bacteria- mutate, produce new strains- antibiotic resistant or one that no one is immune to- epidemic
      • Virus- mutate often, hard to develop a vaccine, if a deadly disease evolved- pandemic


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