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Viruses and bacteria - NetDoctor.co.uk - The UK's leading independent health website
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日期:2024-09-05
Viruses are too small to be seen by the naked eye. How are infections with viruses and bacteria spread? ... What are viruses? Viruses are too small to be seen by the naked eye. They can't multiply on their own, so they have to invade a 'host' cell and tak...看更多