Unit 20 Causes and spread of infection 1.1 Bacteria – are living beings (microorganisms) which are tiny cells. Virus – are none living and cannot reproduce without a cell. Fungi – are mild skin infections. Parasites – is an organism that lives in another organism it has to have a host to live it cannot live independently. 1.2 Bacteria – salmonella, mrsa, tuberculosis, food poisoning. Virus – colds, flu, ear infections, warts. Fungi – ringworm, athlete’s foot…
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