Infection & Response - Spreading Disease

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  • VIRUSES
    • tiny, non-living particles
    • do not contain cells
    • reproduce rapidly within the body
    • invade host cells and use them to make new virus particles
    • the new viruses are made, they cause the cells to burst
    • SPREADING DISEASE
      • BACTERIA
        • small living cells
        • damage cells directly or by producing toxins (poisons)
        • reproduce rapidly
        • need warmth, moisture and oxygen
        • can cause illness
        • toxins can damage cells and tissues
      • FUNGI
        • single-celled organisms
        • have a body made up of hyphae
        • hyphae are able to grow and penetrate tissues
        • hyphae produce spores that can spread to other plants and animals
      • PROTISTS
        • single-celled eukaryotic organisms
        • parasites - live on or inside other organisms
        • transferred to the host organism by a vector
        • can cause illness by damaging tissues
      • WAYS OF DISEASES SPREADING
        • water
        • direct contact
        • air
      • PREVENTING INFECTION SPREAD
        • protecting against vectors
        • vaccinations
        • being hygienic
        • isolating
    • cell damage makes us feel ill

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