Is Serratia marcescens hemolytic?

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 grow on blood 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.

What arrangement is Serratia marcescens?

rod shaped
Cell Structure and Metabolism 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).

How can you tell the difference between Serratia marcescens and E coli?

The key difference between E coli and Serratia marcescens is that E. coli is a coliform bacterium that belongs to genus Escherichia and is a part of normal gut flora while Serratia marcescens is a gram-negative rod-shaped bacteria which has the ability to produce red colour pigment at the room temperature.

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.

What color is Serratia marcescens?

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

How do I know if I have Serratia?

Citrate is used by S. marcescens to produce pyruvic acid, thus it can rely on citrate as a carbon source and test positive for citrate utilization. In identifying the organism, one may also perform a methyl red test, which determines if a microorganism performs mixed-acid fermentation.