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Virus and bacteria

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Virus and bacteria

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Virus and bacteria

  1. 1. Virus and bacteria
  2. 2. Virus - definition <ul><li>Virus - from the Latin virus means toxin or poison. </li></ul><ul><li>It is an infectious agent that is very small to be seen with a light microscope. </li></ul><ul><li>They are not made of cells. </li></ul><ul><li>They can only replicate inside the cells of another organism </li></ul><ul><li>Viruses infect all types of organisms </li></ul>
  3. 3. Virus – what are they made of? <ul><li>They consist of two or three parts: </li></ul><ul><ul><li>Genetic Material (DNA or RNA – carry genetic information – are responsible for determining characteristics) </li></ul></ul><ul><ul><li>Protein Coat – to protect the genetic material </li></ul></ul><ul><ul><li>Some have envelope – made of fat (just like the cell membrane) </li></ul></ul>
  4. 4. How do they spread? <ul><li>carried by blood sucking insects </li></ul><ul><li>spread by coughing and sneezing. </li></ul><ul><li>Through faecal – oral route </li></ul><ul><li>Passed from person to person by contact </li></ul><ul><li>Sexual contact </li></ul><ul><li>Exposure to infected blood. </li></ul>
  5. 5. How to eliminate the virus? <ul><li>Viral infections provoke an immune response – this will eliminate the infecting virus. (The immune system is made of white blood cells – the body’s army) </li></ul><ul><li>Vaccines – are specific. </li></ul>
  6. 6. What does it look like?
  7. 7. Replication
  8. 8. Bacteria <ul><li>Bacteria are a large group of unicellular microorganisms. </li></ul><ul><li>They have a wide range of shapes </li></ul><ul><li>They are found in every habitat </li></ul><ul><ul><li>Soil </li></ul></ul><ul><ul><li>Acidic hot springs </li></ul></ul><ul><ul><li>Radioactive waste </li></ul></ul><ul><ul><li>Water </li></ul></ul><ul><ul><li>Deep in the ocean </li></ul></ul><ul><ul><li>In animals and plants </li></ul></ul>
  9. 9. Bacteria <ul><li>Most bacteria in our body are harmless </li></ul><ul><li>A few species cause infectious diseases </li></ul><ul><ul><li>Cholera </li></ul></ul><ul><ul><li>Syphilis </li></ul></ul><ul><ul><li>Anthrax </li></ul></ul><ul><ul><li>Leprosy </li></ul></ul><ul><ul><li>Bubonic plague </li></ul></ul>
  10. 10. In the industry <ul><li>Sewage treatment </li></ul><ul><li>Production of cheese and yoghurt </li></ul><ul><li>Making antibiotics. </li></ul>
  11. 11. <ul><li>Bacteria are prokatyotes </li></ul>

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