Is Serratia marcescens acid fast positive or negative?
Bacteria Collection: Serratia marcescens Additional Information
| Susceptibility Testing Text: | Potassium cyanide : + |
|---|---|
| Cells Length (µm): | 1.5|1.5|1.5|1.5 |
| GramReaction Text: | negative |
| Acid Fast Staining Text: | negative |
| Motility At 25°C Text: | positive |
Does Serratia marcescens produce acid?
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. 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.
What are the characteristics of Serratia marcescens?
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).
Is Serratia marcescens indole 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].
What infections does Serratia marcescens cause?
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 kind of stain does Serratia marcescens have?
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.
When did Serratia marcescens become an infectious disease?
From 1960 onwards, however, non-pigmented isolates of S. marcescens predominated over pigmented strains in the clinical setting and were increasingly implicated in healthcare-associated infection ( 24, 30) particularly among compromised patients.
When does a Serratia marcescens biofilm slough away?
Once created, an S. marcescens biofilm regularly sloughs away when its thickness has reached a certain height. This practically automated process allows multiple infection sites to form within a short period of time.
What happens if Serratia marcescens touches your eye?
If an infected hand touches the eye and natural immunity is unable to fend off Serratia colonization, the result might be conjunctivitis, keratitis or tear duct infections, for example. Once in the bloodstream, Serratia bacteria can cause endocarditis]
How is Serratia marcescens able to produce acid?
Serratia marcescens was able to metabolize mannitol to produce acid, but gas was not produced. Enterotube– The tests and their results are as follows: – Glucose– Positive for the fermentation of glucose to produce acid, but negative for the production of gas. Lysine– Positive.
Why is citrate a positive test for Serratia marcescens?
Cell Structure and Metabolism. Nitrate tests are positive since nitrate is generally used as the final electron acceptor rather than oxygen [4]. Citrate (positive test) is used by Serratia marcescens to produce pyruvic acid. It is positive for decarboxylase, which is the removal of a carboxyl group from an amino acid,…
How is Serratia marcescens a Gram negative rod?
The organism grew as dark red colonies against the light pink background of the media. Gram stain of Serratia marcescens. Gram staining a sample of the organism from a pure culture revealed that it was a gram negative rod. Oxidation Fermentation tests. The organism was able to grow in both aerobic and anaerobic tubes.
If an infected hand touches the eye and natural immunity is unable to fend off Serratia colonization, the result might be conjunctivitis, keratitis or tear duct infections, for example. Once in the bloodstream, Serratia bacteria can cause endocarditis]
