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Bacteria and viruses are the most important causes of disease. Bacteria are simple plants like organisms that can divide very quickly. They cause many common infections such as boils and acne. Viruses are very much smaller, and technically they are not alive at all.
They can take over the functioning of an infected cell and turn it into a factory producing millions more viruses. Viruses are responsible for many common diseases such as colds and influenza.
What happens if the immune system
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Tags: bacteria,
infection,
immune system,
viruses
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