big study in 2012...if it’s viral, and 90% of sinus infections are viral, antibiotics are useless. And for most baterial sinus infections, antibiotics arn’t needed.
http://www.entnet.org/HealthInformation/antibiotics.cfm
http://www.cnn.com/2012/02/14/health/antibiotics-not-helpful-sinus-infections/
http://www.cdc.gov/getsmart/antibiotic-use/uri/sinus-infection.html
I was in the hospital for 11 days with a sinus infection that threatened to kill me—and when at home was on IV antibiotics. One winter I was on a low dose of antibiotics all winter just to keep me going. So study away. There is also a study that says the earth is warming, right?