How can you treat moraxella osloensis sinusitis? oral antibiotics?

Moraxella osloensis is a gram negative bacteria, it generally is susceptible to penicillins, cephalosporins and aminoglycosides among others. It should be easily treated by your doctor with oral antibiotics. Though sometimes this bacteria has been known to simply be what's known as a colonizer (meaning the bacteria, while present, isn't what is causing the infection).