What is the difference between virus and bacteria?
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On a biological level, the main difference is that bacteria are free-living cells that can live inside or outside a body, while viruses are a non-living collection of molecules that need a host to survive.
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On a biological level, the main difference is that bacteria are free-living cells that can live inside or outside a body, while viruses are a non-living collection of molecules that need a host to survive. Viruses are more dangerous than bacteria as they do cause diseases. In some infections, like pneumonia and diarrhea, it's difficult to determine whether it was caused by bacteria or a virus and testing may be required.
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