Pathogens

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Pathogens

  1. 1. Pathogens Lesson Objectives To describe the differences between viruses and bacteria. To evaluate the contribution of Semmelweiss in controlling infection Then write down a list of any diseases / illness you have had caused by pathogens. http://uk.youtube.com/watch?v=Aus9V_UNbiI
  2. 2. SO WHAT IS A PATHOGEN? <ul><li>A pathogen is a disease causing microbe. These can be caused by bacteria or virus. </li></ul><ul><li>Infectious diseases are found all over the world. They are caused by a microorganism entering and attacking the body. </li></ul><ul><li>If you can pass the microorganism on this means you are infectious. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  3. 3. The structure of bacteria Science Photo Library/ Alfred Pasieka Cell membrane Slime capsule Cell wall Cytoplasm Genetic material Plasmids Flagella
  4. 4. The structure of a virus Science Photo Library: Kari Lounatmaa Protein coat Genetic material
  5. 5. Types of bacteria AQA Science © Nelson Thornes Ltd 2006 
  6. 6. Staphylococcus aureus AQA Science © Nelson Thornes Ltd 2006  Photodisc 72(NT)/Duncan Smith
  7. 7. HOW PATHOGENS CAUSE DISEASE. <ul><li>Once these pathogens are inside your body they cause disease because they reproduce rapidly. </li></ul><ul><li>Bacteria do this by splitting in two. They often produce toxins at the same time. </li></ul><ul><li>Viruses actually take over cells, damaging and destroying them. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  8. 8. IGNAZ SEMMELWEISS <ul><li>H- In the mid 1850s, many women who gave birth in hospital died from childbed fever a few days after. </li></ul><ul><li>E- Semmelweiss realised his medical students went straight from dissecting dead bodies to delivering babies without washing their hands. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  9. 9. IGNAZ SEMMELWEISS <ul><li>B - Next another doctor cut himself whislt working on a body and died from the same symptoms. </li></ul><ul><li>He become convinced an infectious agent was causing this. </li></ul><ul><li>I- On insisting his students washed their hands deaths significantly reduced. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  10. 10. IGNAZ SEMMELWEISS <ul><li>F- However, his ideas were mocked by the medical community. </li></ul><ul><li>Doctors did not want to believe they were causing it. </li></ul><ul><li>In those days with no indoor plumbing and harsh chemicals washing hands was difficult. </li></ul><ul><li>Then J and C followed by D </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  11. 11. IGNAZ SEMMELWEISS <ul><li>G- It is thought MRSA would be less of a problem if visitors washed their hands more. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  12. 12. WAS HE RIGHT? AQA Science © Nelson Thornes Ltd 2006 
  13. 13. Homework <ul><li>What was the problem with thalidomide in the 1960s? </li></ul>

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