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Virus and Bacteria Mutation

The age-old struggle against the common cold is evidence of micro-evolution in action. A strain of flu virus is only effective when it takes on a new form to which hosts have yet to develop an immunity. As soon as an immunity develops, the virus is suppressed until new mutations lead to a new strain. Given their short life-cycles, viruses and bacteria churn through generations quickly, allowing mutations to accumulate many times faster than they do in animal or plant species.