I am Sinus infection free and have not had a Sinus infection since about 2002.
I have still not had another sinus infection. I used to get sinus infections, one after another, for many years, until I discovered how to use hydrogen peroxide to permanently cure me of nasty, painful, miserable sinus infections!
Basically, I use peroxide to protect the infection-damaged areas, within my sinuses/nasal passages, from reinfecting until those infection-damaged areas are totally healed and resistant to infection.