communicable disease

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  • communicable disease
    • pathogens and disease
      • A pathogen is a microorganism that causes a disease. There are four main types of pathogen:
        • viruses, fungi, bacteria and protist
      • All types of pathogen have a simple life cycle. They infect a host, reproduce themselves or replicate if it is a virus,
    • preventing diseases
      • Vaccinations introduce a small or weakened version of a pathogen into your body, and the immune system learns how to defend itself.
      • Chemicals or UV light kill pathogens in unclean water.
    • human defence system
      • The first line of defence against infection stops the pathogens from entering your body.
      • The skin covers almost all parts of your body to prevent infection from pathogens.
    • health and diseases
      • communicable, which are caused by pathogens and can be transferred from one person to another, or from one organism to another, eg in humans,
      • these include measles, food poisoning and malaria
    • bacteria diseases
      • Not all bacteria are pathogens which cause disease. Many bacteria, like those found in the intestines, are useful.
      • All bacteria are prokaryotes, and do not have a nucleus.
    • protist diseases
      • Protists are a group of microorganisms that have features that belong to animals, plants and fungi.


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