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Microorganisms are excellent survivalists. They seek the optimum circirmstances to survive, and develop defense strategies of their own to fight our attempts to kill them. Some have developed such high strategies, they are more infectious and/or spread easily, such as airborne viruses and bacteria. Others change in response to the newest medications developed to fight the infection, like antibiotic-resistant infections. The mode of travel--e.g. airborne in particular--ensures the organism finds a new host.

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Q: Why are some microorganisms more infectious than others?
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