For example, Methicillin-resistant Staphylococcus aureus (MRSA) is a strain of bacteria that mutated from the bacteria Staphylococcus aureus. This specific strain came about by natural selection against Methicillin, as its name suggests. The strain must have already previously existed before patients were treated with Methicillin and when they were the Methicillin killed off all of the bacteria besides the MRSA ones allowing them to spread about while the host felt like...
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... So a good plan to take would be to start trials on new drugs to fight everyday infections and even more serious infections such as MRSA. Once new drugs are found to fight everyday infections they can be used to treat those in hospitals instead of using antibiotics.
But this would of course lead to bacteria mutating against these new drugs as well, so in an ideal plan new drugs should always be in trial stages for bacterial infections. Doing this allows for a back-up plan for the majority of situation which would allow us to kill us new strains of bacteria that have mutated against other drugs so we can hopefully keep those levels of strains down. After a few good drugs have been created to treat the majority of infections ideally there shouldn’t be an infection we couldn’t get rid of because if it is immune to one drug we could always use another to get rid of it.
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