General Biology
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S. aureus diagnoses were brought on by MRSA six months after methicillin was successfully used to treat S. aureus outbreaks in a community. What is the easiest way to understand this?
The vaccine used contains a stronger strain of bacteria.
Some S. aureus bacteria were able to survive and had evolved to a more resistant type.
Another source of infection had sprung.
The vaccine was not able to identify the target species.