What color is Serratia marcescens on MacConkey Agar?
dark red
Growth on Macconkey’s agar. Since the gram stain of Serratia marcescens revealed that the organism was a gram negative bacteria, MacConkey’s agar served as a selective media. The organism grew as dark red colonies against the light pink background of the media.
What is the morphology of Serratia marcescens?
Serratia marcescens is a Gram-negative, facultatively anaerobic, rod-shaped bacterium belonging to the family Enterobacteriaceae.
What color colony should Serratia marcescens produce?
red pigment
Serratia Marcescens is a strain of bacteria commonly found in the environment. S. Marcescens produces a red pigment (i.e. colonies are red) when grown at 24-30°C.
What are the characteristics of Serratia marcescens?
Serratia marcescens is a motile,short rod-shaped, Gram-negative, facultative anaerobe bacterium, classified as an opportunistic pathogen. It was discovered in 1819 by Bartolomeo Bizio in Padua, Italy.
What does Serratia marcescens look like on agar?
Serratia marcescens. Medium-sized colonies that appear buff in colour on Blood Agar. The bacteria produce a red pigment which is easily seen when grown on blood-free media such as nutrient agar or Kings agar B. This culture has been incubated at 30°C.
Is Serratia marcescens oxidase positive or negative?
Biochemical Test and Identification of Serratia marcescens
| Basic Characteristics | Properties (Serratia marcescens) |
|---|---|
| Oxidase | Negative (-ve) |
| Pigment | Positive (+ve) |
| Shape | Rods |
| Spore | Negative (-ve) |
Where is Serratia marcescens normally found?
marcescens can cause a wide variety of infections, ranging from UTIs, bacteremia, pneumonia, and CNS infections, to other less common infections, including ocular infections. The most common site of infection is the urinary tract, but the organism is frequently isolated from the respiratory tract and wounds.
What is Serratia marcescens habitat?
Serratia marcescens is a Gram-negative bacterial species that can be found in a wide range of environments like soil, water and plant surfaces, while it is also known as an opportunistic human pathogen in hospitals and as a plant growth promoting bacteria (PGPR) in crops.
How does Serratia marcescens produce red pigment?
Serratia marcescens is a gram-negative, facultatively-anaerobic bacterium and opportunistic pathogen which produces the red pigment prodigiosin. We employed both batch culture and chemostat growth methods to investigate prodigiosin function in the producing organism.
Are Serratia motile?
S. marcescens is a motile organism and can grow in temperatures ranging from 5–40 °C and in pH levels ranging from 5 to 9.
What is the significance of Serratia marcescens?
The opportunistic pathogen Serratia marcescens is a common cause of urinary tract and ocular lens infections. It has also been linked with endocarditis, osteomyelitis, septicemia, wound and respiratory tract infections.
Is Serratia Gram positive or negative?
Serratia species are gram-negative bacilli of the Enterobacteriaceae group of bacteria, although they are not a common component of healthy human fecal flora.
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