How do we deal with disease? AQA GCSE Biology

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  • Created by: Caitlinyx
  • Created on: 24-04-13 21:05
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  • How do we deal with disease?
    • The Whooping Cough Story
      • In the 1970's, Dr John Wilson, a specialist in treating children, published a report suggesting that the pertussis (whooping cough) vaccine might cause brain damage in some children
        • The study was based on a small group of 36 children
        • The media published the story and parents paniced
          • The number of children being vaccinated fell from 80% to 30%, which was too low to protect the population from disease
            • People were more worried about the vaccine that they forgot that the whopping cough cause brain damage and death
              • In Scotland about 100,000 children got whooping cough between 1977 and 1991. Around 75 died and there was a similar pattern in the UK
      • Investigation into the origional research shows flaws
        • Identical twin girls were used later died of a rare genetic disorder and never had the vaccine
        • It was a small study and only 12 children  investigated showed any symtoms close to the time of the vaccine
          • Their parents were involved in claims for compensation to the vaccine manufacturers
            • In the court case the whole study was questioned, and after the evidence they decided that the risks of the whooping cough were worse than the risks of the vaccine
    • Medicines for the Future
      • The development of resistant bacteria means that scientists are looking into other forms of fighting bacteria
        • It isn't easy to find chemicals that kill pathogens but do not harm the human cells
      • Penicillin and several antibiotics are made from moulds. Scientists are collecting soil samples from all over the world to find a mould that will kill abcteria
      • Crocodiles have rotting meat in their teeth, live in dirty water and often fight with eachother, bitng eachother, but the bites do not get infected.
        • They have extracted a chemical called 'crocodillin' from the blood and it seems to be a powerful antibiotic
      • Fish such as plaice are covered in a slime that protects them from damage and infection. In this they have found a protein with antibiotic properties that can kill bacteria
      • Honey has been used for many years for healing wounds. Scientists have found honey with antibiotic properties taht kill bacteria including MRSA
        • Doctors are using manuka honey on dressings and to treat infected wounds


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