-tiny. -reproduce in host cells. -central core containing DNA/RNA that is encased by a protein coat. -some have tails.
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what do viruses cause?
-flu. -mumps. -AIDs. -measles. -German measles.
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describe the appearance of a fungi.
-large. -multicellular hypha.
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what does fungi cause?
-thrush. -athletes foot. -ringworm.
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how do pathogens enter the body?
by penetrating the digestive system in food/water or the gas exchange system.
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what natural defences are there?
-enzymes that break down pathogens. -stomach acid which kills microorganisms. -a mucus layer covering the gas exchange system, making a sticky barrier which is difficult to penetrate.
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how do pathogens cause disease?
-by damaging host tissues if the sheer number of pathogens break down the membranes. -by producing toxins.
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what is a risk?
a measure of probability that damage to health will occur as a result of a given hazard.
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