Infectious Diseases part 1

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  • Infectious Diseases1
    • Pathogens- disease causing microrgamism
      • Bacteria, Viruses and fungi
      • Bacteria- produces toxins that make us feel ill
      • Viruses(very, very small)- reproduce in a host cell. keep reproducing till they fill whole cell and it bursts
      • The pathogens are not the disease - they cause the disease
    • White blood cells
      • (phangocytes)Ingest pathogens
      • Produce antibodies that match the antigens on the pathogen.
      • Produce antitoxins which counteract (neutralise) the toxins released by the pathogen
    • Vaccination- putting a small amount of an inactive or dead pathogen, into the body.
      • The body produces specific antibodies to kill a particular pathogen.
      • The white blood cells produce antibodies to match the antigens- next time the body meets this pathogen it recognizes it and can produce the antibodies needed to kill it quickly
      • Large proportion of the population immune to a pathogen = spread of the pathogen  reduced.
    • Semmelweis- Hand washing guy
      • Noticed a higher case of  childbed fever (birth disease) when doctors had just treated the dead
      • Insisted that doctors washed their hands before examining patients
        • Reduced number of deaths in hospitals from infectious diseases
      • Bacteria not yet discovered so doctors went from patient to patient without washing hands


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