Donna
It is not common to get a staph infection after sinus surgery. You could have had the infection before the surgery or caught it in the hospital. I do not respond well to oral antibiotics and when I have sinus infections, usually I am treated with IV antibiotics. I have had staph, MRSA, and strep infections in my sinuses. An ENT can culture your sinuses and tell you what you have and what antibiotic will work to kill the infection. Good luck and God Bless.