Serratia odorifera, a member of the Enterobacteriaceae family, was first described in 1978 by Grimont et al. Although, Serratia marcescens is a well-known and most commonly isolated pathogen, other species such as S. odorifera are rarely isolated and seldom cause infection in humans. This clinical case emphasizes a rare association of S. odorifera infection with diffuse pulmonary involvement. Clinical cases that report this association are rare. The isolation of this agent in respiratory secretions should not be considered colonization but should be interpreted in the clinical context of the patient.

Keywords: Serratia odorifera; Atypical pneumonia; Ground-glass opacification