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Biology Topic 5 - Health, Disease and the Development of Medicines (5c -…

- - - - rapid variation in number of cases over time
      - cases are often localised
      - e.g. malaria, typhoid, cholera
    - - number of cases changes only gradually
      - cases may be more widely spread
      - e.g. cancer, diabetes, heart disease
    - - bacteria
        
        may release toxins (poisons), make you feel ill
        
        some types invade and destroy body cells
      - when inside body, reproduce rapidly
      - large number will make you ill
      - viruses
        
        can take over body cell's DNA, causing cell to make toxins
        
        or causing damage when new viruses are released from the cells
      - fungi
        
        eukaryotic organisms
      - protists
        
        eukaryotic organisms
        
        many are free-living
        
        some are pathogens
        
        damage cells or change how they work