What is unique about Serratia marcescens?

marcescens notable in the world of antibiotic resistance. Beyond chromosomal-mediated resistance, it also has the ability to acquire resistance mechanisms from other bacteria and is intrinsically resistant to penicillin G, clindamycin, macrolides, glycopeptides, linezolid, and rifampin. Most isolates of S.

What is the colony morphology of Serratia marcescens?

Gram stain of Serratia marcescens shows typical “short rod” morphology. Due to limits of resolution using a light microscope, single rods often resemble pairs of cocci or coccoidal cells.

How can you tell the difference between Serratia?

The deoxyribonuclease (DNase) test has been suggested to differentiate Serratia (1, 18) and is satisfactory for separating Klebsiella and Serratia. biochemical reactions similar to those of S.

Is Serratia marcescens G (+) or G?

Serratia marcescens (S. marcescens) is a gram-negative bacillus that occurs naturally in soil and water and produces a red pigment at room temperature. It is associated with urinary and respiratory infections, endocarditis, osteomyelitis, septicemia, wound infections, eye infections, and meningitis.

Is Serratia marcescens aerobic or anaerobic?

facultative anaerobic
Ok, now Serratia marcescens is motile and also facultative anaerobic which means it can survive in both aerobic and anaerobic environments.

Where is Serratia found?

It is commonly found in the respiratory and urinary tracts of hospitalized adults and in the gastrointestinal systems of children. Due to its abundant presence in the environment, and its preference for damp conditions, S.

What is the texture of Serratia marcescens?

For comparison purposes, after 3 days of incubation at 30°C, the S. marcescens MG1 parental wild-type colonies were ∼4 mm in diameter, had a “non-sticky-to-touch” colony texture, and had a rough or grainy appearance (Fig. ​ 2A).

Is Serratia gram positive or negative?

gram-negative bacilli
Serratia species are gram-negative bacilli of the Enterobacteriaceae group of bacteria, although they are not a common component of healthy human fecal flora.

How is Enterobacter different from Serratia?

Thus, a rapid test has been needed to differentiate Serratia from Enterobacter. Serratia produces the blue-green indigo color within 5 min., whereas Enterobacter produces the blue-green color in half an hour.

Is Serratia Gram positive or negative?

What temperature does Serratia marcescens grow?

25-37C
Perhaps it is noteworthy that the optimal growth range for Serratia marcescens is 25-37C, and it is above this temperature range that pigment production ceases. It is possible that the loss of pigment is associated with mild temperature stress.

Why does Serratia marcescens turn red?

Serratia marcescens is a gram-negative, facultatively-anaerobic bacterium and opportunistic pathogen which produces the red pigment prodigiosin.