History of sinus infections +dx of uctd. recent sinus cultures positive atypical bacteria (serratia marcescens +stenotrophomonasmaltophilia - why?

ID physician: S maltophilia is an organism of low virulence and frequently colonizes fluids used in the hospital setting and patient cultures. Serratia species are opportunistic gram-negative bacteria that are widespread in the environment. And something is definitely wrong here...unless your on say prednisone (for MCTD) and didn't mention this. You should see an infectious disease physician ASAP.