I have serratia marscesens in my sinus.I had surgery last year and had masses of thick junk removed. I went in again for additional surgery to get another culture to confirm if serratia is still present. I cannot take levaquin as I had a tendonitis reaction. The plan is to consider IV antibiotic after the culture. I have constant drainage, and get sores on the tip of my noses from the drainage. I also have severe pain in the back of my head. I'm hoping there is an Iv antibiotic that will clear this infection from my sinuses once and for all.Is this an unusual infection?