Found in soil and water.
• Gram negative and motile.
• Species of medical importance: S.marcescens
• Causing UTI, pulmonary infections and cross
infections in the hospital.
• Grows well on blood and MacConkey agar.
• Produces Non-lactose fermenting colonies.
• Some strains produce red pigment on nutrient agar.
• Resistant to cephalosporins and polymyxins.
• Ferments lactose slowly