Thank you for the microbiology report.
Sensitivity testing results were not provided but, in any event, the bacteria isolated is one that is commonly associated with boils.
You are receiving the correct treatment. That being said, if the boils are continuing to return again and again then the next step would be to have a complete medical examination looking for any underlying immune system deficiency you might have.
Of course, moving to a cooler climate might help also as well as washing with a high quality soap at least once a day.
Here is an excellent article from a highly respected source that you might find helpful:
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Dr. Rick MD FACS