Pronunciation of marcescens with 2 audio pronunciations, 2 translations and more for marcescens. Serratia species are gram-negative bacilli of the Enterobacteriaceae group of bacteria, although they are not a common component of healthy human fecal flora. Pronunciation of Serratia marcescens with 2 audio pronunciations, 2 synonyms, 3 translations and more for Serratia marcescens. Serratia marcescens (/ s ə ˈ r eɪ ʃ i ə m ɑːr ˈ s ɛ s ɪ n z /) [failed verification] is a species of rod-shaped, Gram-negative bacteria, that is also a facultative anaerobic organism, classified as an opportunistic pathogen in the family Yersiniaceae.It was discovered in 1819 by Bartolomeo Bizio in Padua, Italy. Habitat. Serratia marcescens Currently, four species of Serratia have been found in sea water: S. marcescens, S. liquefaciens, S. plymuthica, and S. marinorubra.S. marcescens is the most abundant, comprising approximately half of all strains found. Medical definition of Serratia: a genus of aerobic saprophytic flagellated rod-shaped bacteria of the family Enterobacteriaceae that occur as rods, commonly produce a bright red pigment, and include one (S. marcescens) associated with some human opportunistic infections. How to say Serratia marcescens in English? Various strains of Serratia occupy an eclectic range of habitats: soil, water, plants, insects, and others.. Water. INTRODUCTION. How to say marcescens in English? Serratia marcescens Microbiology The type-species of the gram-negative Serratia, widely present in the environment, and occasional cause of hospital-acquired infections Asssociations Contaminated fluids, equipment, cleaning solutions, hands, ↓ nurse-to-Pt ratio.See Serratia.