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Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
Pathogensfound
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Pathogensfound

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  • 1. Pathogens Lesson Objectives To know the difference between viruses and bacteria. Starter Then write down a list of any diseases / illness you have had caused by pathogens.
  • 2. SO WHAT IS A PATHOGEN?
    • A pathogen is a disease cause 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 
  • 3. The structure of bacteria Science Photo Library/ Alfred Pasieka Cell membrane Slime capsule Cell wall Cytoplasm Genetic material Plasmids Flagella
  • 4. The structure of a virus Science Photo Library: Kari Lounatmaa Protein coat Genetic material
  • 5. Types of bacteria AQA Science © Nelson Thornes Ltd 2006 
  • 6. Staphylococcus aureus AQA Science © Nelson Thornes Ltd 2006  Photodisc 72(NT)/Duncan Smith
  • 7. 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 
  • 8. 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 
  • 9. 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 
  • 10. 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 
  • 11. 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 
  • 12. WAS HE RIGHT? AQA Science © Nelson Thornes Ltd 2006 
  • 13. Homework
    • What was the problem with thalidomide in the 1960s?

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