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Communicable diseases (pathogens (they are microorganisms that enter the…
Communicable diseases
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they replicate themselves using the cells machinery to produce many copies of themselves, the cell then bursts releasing all the new viruses
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three viral diseases
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HIV
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it attacks the immune cells and if the immune system becomes badly damaged, it cannot cope with other infections leading to AIDs
tobacco mosaic virus
virus which affects plants and causes a mosaic pattern on the leaves of the plant - leaves become discoloured
the discolouration means the plant struggles to carry out photosynthesis so it affects the plants growth
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