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MRSA is methicillin-resistant Staphylococcus aureus.
MSSA is Staphylococcus aureus that does respond to methicillin class antibiotics.
I'm sorry buy I'm unfamiliar with the antibiotic "celf" you referenced here "...I tested positive for MSSA to be treated with celf?"
Ciprofloxacin is one of the antibiotics typically prescribed for MSSA.
Properly treated, MSSA doesn't "become" MRSA.
Please let me know what additional questions you may have about this.