Does Serratia marcescens produce acid?

Serratia marcescens was able to metabolize mannitol to produce acid, but gas was not produced. Glucose – Positive for the fermentation of glucose to produce acid, but negative for the production of gas.

What does Serratia marcescens produce?

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.

What is the pH of Serratia marcescens?

Identification. 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.

Is Serratia marcescens a lactose fermenter?

Now, Serratia marcescens and also Citrobacter are slow lactose fermenters, so they are a bit lazy, but eventually ferment lactose.

Does Serratia marcescens produce gas?

Serratia marcescens was able to metabolize mannitol to produce acid, but gas was not produced. Glucose – Positive for the fermentation of glucose to produce acid, but negative for the production of gas.

Osmosis | Serratia Marcescens

Is Serratia marcescens catalase positive?

The Biochemical identification of Serratia marcescens showed that bacteria were Gram –ve, Rod, Catalase positive, oxidase negative, lactose non- fermenter, motile, Indole negative, citrate utilization positive, TSI y/y, DNase positive and Urease negative as shown in table (1) as [27].

Is Serratia marcescens aerobic?

Serratia marcescens is short and rod shaped. It is a facultative anaerobe, meaning that it can grow in either the presence of oxygen (aerobic) or in the absence of oxygen (anaerobic).

What are the characteristics of Serratia marcescens?

Serratia marcescens is a gram-negative rod-shaped facultatively anaerobic bacterium that is extremely motile. An S. marcescens gram stain shows short, pink-colored dots, as seen below. Rod-shaped bacteria, bacilliform bacteria or bacilli describe the typical shape of Serratia marcescens.

Why does Serratia marcescens turn red?

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

Does Serratia marcescens grow on MacConkey Agar?

Culture: S. marcescens grows well on blood agar and MacConkey agar. It is non-lactose fermenting. Some strains produce a red pigment in nutrient agar, tryptic soy agar, MacConkey agar at room temperature.

Why is Serratia marcescens used for science experiments?

S. marcescens was at one time believed to be non-harmful. It was used in experiments by teachers and scientists because of its intense red color. The bacterium was at one time used to show why hand washing is so vital.

Is Serratia marcescens Lipase positive?

Most strains of Serratia marcescens produced both enzymes while most strains of Serratia liquefaciens exhibited strong lipase but only a minor phospholipase activity.

What are the virulence factors of Serratia marcescens?

Serratia species secrete several virulence factors, such as DNase, lipase, gelatinase, hemolysin, proteases, chitinase, chloroperoxidase, and multiple isozymes of alkaline phosphatase, and also produce carbapenem antibiotics, a red pigment named prodigiosin (Figure 29), and biosurfactants.

Why is Serratia marcescens important?

Serratia marcescens is an important cause of nosocomial infections in both human and veterinary medicine. In human patients it is often linked to intravenous drug use. The organism has a tremendous ability to survive in the environment and may contaminate and remain viable in disinfectant solutions.

Is Serratia marcescens harmful?

Today, Serratia marcescens is considered a harmful human pathogen which has been known to cause urinary tract infections, wound infections, and pneumonia.

Is Serratia marcescens hemolytic?

Background: Serratia marcescens is a gram-negative bacterium and often causes nosocomial infections. There have been few studies of the virulence factors of this bacterium. The only S. marcescens hemolytic and cytotoxic factor reported, thus far, is the hemolysin ShlA.

Does Serratia marcescens have an odor?

MACROSCOPIC APPEARANCE. Colonies often appear opaque, somewhat iridescent, white, pink, magenta, or red. Cultures can produce two kinds of odors, a fishy to urinary odor or a musty, potato-like odor.

What is the morphology of Serratia marcescens?

Introduction. Serratia marcescens is a Gram-negative, facultatively anaerobic, rod-shaped bacterium belonging to the family Enterobacteriaceae.

Is Serratia marcescens a Thermophile?

The mesophile Serratia marcescens grows normally in the temperature range of 20" to 37" C; its lower limit of growth is 10". Recently, a red-pigmented organism, which grows only in the temperature range 0" t6 19" C, was isolated froin flounder's eggs (1).

Does Serratia marcescens form endospores?

marcescens are unable to form true endospores, which is in contrast to the results described by Girija et al. (17) and Ajithkumar et al.

Is Serratia a coliform?

The genera Escherichia, Klebsiella, Enterobacter, Serratia, and Citrobacter (collectively called the coliform bacilli) and Proteus include overt and opportunistic pathogens responsible for a wide range of infections.

Is Serratia marcescens positive for oxidase?

While all the organisms are gram negative rods, S. marcescens is the only lactose nonfermenter that is motile, oxidase negative and indole negative.

Does Serratia marcescens hydrolyze casein?

S. marcescens is differentiated from other Gram-negative bacteria, as it is able to perform casein hydrolysis.

Is S. marcescens catalase negative?

Gram staining showed that they were gram negative bacilli which were catalase positive and oxidase negative. The organisms were motile and they showed DNAse and gelatinase production.