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Much smaller than bacteria, viruses are not independent organisms; they need one of your body's cells, or host cell, to reproduce, unlike bacteria, which can reproduce on their own. A virus invades a host cell, switches out the host's genetic code with its own, then uses the cell's equipment and resources to pump out lots and lots of new viruses, which go off and invade other host cells.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.