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Pathogensfound
 

Pathogensfound

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    Pathogensfound Pathogensfound Presentation Transcript

    • Pathogens Lesson Objectives To know the between viruses and bacteria. Starter Then write down a list of any diseases / illness you have had caused by pathogens.
    • SO WHAT IS A PATHOGEN?
      • A pathogen is a disease causing microbe. These can be caused by bacteria or virus.
      • Infectious diseases are found all over the world. They are caused by a microorganism entering and attacking the body.
      • If you can pass the microorganism on this means you are infectious.
      AQA Science © Nelson Thornes Ltd 2006 
    • The structure of bacteria Science Photo Library/ Alfred Pasieka Cell membrane Slime capsule Cell wall Cytoplasm Genetic material Plasmids Flagella
    • The structure of a virus Science Photo Library: Kari Lounatmaa Protein coat Genetic material
    • Types of bacteria AQA Science © Nelson Thornes Ltd 2006 
    • Staphylococcus aureus AQA Science © Nelson Thornes Ltd 2006  Photodisc 72(NT)/Duncan Smith
    • HOW PATHOGENS CAUSE DISEASE.
      • Once these pathogens are inside your body they cause disease because they reproduce rapidly.
      • Bacteria do this by splitting in two. They often produce toxins at the same time.
      • Viruses actually take over cells, damaging and destroying them.
      AQA Science © Nelson Thornes Ltd 2006 
    • IGNAZ SEMMELWEISS
      • H- In the mid 1850s, many women who gave birth in hospital died from childbed fever a few days after.
      • E- Semmelweiss realised his medical students went straight from dissecting dead bodies to delivering babies without washing their hands.
      AQA Science © Nelson Thornes Ltd 2006 
    • IGNAZ SEMMELWEISS
      • B - Next another doctor cut himself whislt working on a body and died from the same symptoms.
      • He become convinced an infectious agent was causing this.
      • I- On insisting his students washed their hands deaths significantly reduced.
      AQA Science © Nelson Thornes Ltd 2006 
    • IGNAZ SEMMELWEISS
      • F- However, his ideas were mocked by the medical community.
      • Doctors did not want to believe they were causing it.
      • In those days with no indoor plumbing and harsh chemicals washing hands was difficult.
      • Then J and C followed by D
      AQA Science © Nelson Thornes Ltd 2006 
    • IGNAZ SEMMELWEISS
      • G- It is thought MRSA would be less of a problem if visitors washed their hands more.
      AQA Science © Nelson Thornes Ltd 2006 
    • WAS HE RIGHT? AQA Science © Nelson Thornes Ltd 2006 
    • Homework
      • What was the problem with thalidomide in the 1960s?