Klebsiella Pneumoniae Characteristics Quiz

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Questions and Answers

What is the appearance of Klebsiella colonies on MacConkey agar?

Lactose-fermenting red colonies

What is a unique characteristic of Klebsiella pneumoniae in terms of hydrogen sulphide production?

They do not produce hydrogen sulphide

What are the virulence factors of Enterobacter species on MacConkey agar?

Pink colored mucoid colonies

Which Enterobacter species is urease negative among the commonly encountered ones?

E.aerogenes Signup and view all the answers

What is the red-colored pigment produced by Serratia marcescens?

Prodigiosin Signup and view all the answers

Which genus of bacteria may occasionally cause meningitis and septicemia?

Enterobacter Signup and view all the answers

Name three species of Serratia that are of clinical significance.

S.liquifaciens, S.rubidaea, S.marcescens Signup and view all the answers

At what temperature is the pigment prodigiosin best formed in Serratia marcescens?

15-20°C Signup and view all the answers

What are the typical biochemical test results for Serratia marcescens on Triple Sugar Iron (TSI) agar?

A/A or K/A; +/- gas (does not ferment lactose), Citrate +, Motility +, Urea +/- Signup and view all the answers

Which bacterial group includes Proteus, Morganella, and Providencia species?

4-Proteus-morganella-providencia group Signup and view all the answers

What is the characteristic method of movement for Proteus species on solid media?

Swarming Signup and view all the answers

What is the virulence factor associated with Proteus species that results in rapid hydrolysis of urea?

Urease Signup and view all the answers

What are the growth characteristics of Enterobacteriaceae?

Gram-negative rods, either motile with peritrichous flagella or nonmotile; grow well on MacConkey's agar; grow aerobically and anaerobically (facultative anaerobes); ferment glucose with gas production; catalase-positive, oxidase-negative, and reduce nitrate to nitrite. Signup and view all the answers

How can lactose-fermenting colonies be distinguished from non-lactose-fermenting colonies of Enterobacteriaceae?

Culture on 'differential' media that contain special dyes and carbohydrates (eg, EMB, MacConkey agar) distinguishes lactose-fermenting (colored) from non-lactose-fermenting colonies (nonpigmented). Signup and view all the answers

What are some common characteristics of Klebsiella, Enterobacter, and Serratia within the Enterobacteriaceae family?

Klebsiella, Enterobacter, and Serratia are clinically significant members of Enterobacteriaceae; they are gram-negative rods with specific growth and biochemical characteristics. Signup and view all the answers

What are some virulence factors associated with Enteroaggregative Escherichia coli (EAEC)?

Enteroaggregative Escherichia coli (EAEC) can produce biofilms, adhere to epithelial cells, and secrete toxins that contribute to its pathogenicity. Signup and view all the answers

How are nosocomial infections related to Enterobacteriaceae?

Enterobacteriaceae are common causes of nosocomial infections due to their ability to colonize healthcare environments and infect vulnerable patients. Signup and view all the answers

Why is the antigenic structure of Enterobacteriaceae considered complex?

The complex antigenic structure of Enterobacteriaceae consists of various antigens that contribute to their diversity and ability to evade host immune responses. Signup and view all the answers

Study Notes

Klebsiella

Produce extracellular polysaccharides, giving a mucoid appearance to colonies
Do not produce hydrogen sulfide
Fimbriated, nonmotile, and nonsporing
Lactose-fermenting, urease-positive, and indole-negative
Over 80 serotypes based on capsular K antigens and somatic O antigens

Enterobacter

Motile, capsulated, and form pink, mucoid colonies on MacConkey agar
MR negative, VP positive, indole negative, citrate positive
12 species, with E. aerogenes and E. cloacae most commonly encountered in clinical specimens
E. aerogenes is urease negative, while E. cloacae is urease positive
Associated with opportunistic infections, including UTI, respiratory tract infection, and cutaneous wounds

Serratia

Motile, gram-negative coccobacilli that may form capsules
S. marcescens is the most frequently encountered species
Form smooth, convex colonies with crenated edges and produce a red-colored pigment (prodigiosin)
TSI A/A or K/A, +/- gas, citrate +, motility +, urea +/-
Produce DNase, lipase, and gelatinase

Proteus-Morganella-Providencia group

Proteus species move actively by means of peritrichous flagella, resulting in "swarming" on solid media
Urease positive, resulting in rapid hydrolysis of urea with liberation of ammonia
Produce infections in humans, including urinary tract infections and bacteremia, pneumonia, and focal lesions in debilitated patients
Providencia species are usually urease negative and do not swarm on solid media
Recognized by their 'fruity' smell

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Description

Test your knowledge on the characteristics of Klebsiella pneumoniae, including their appearance on agar plates, motility, sporing, and biochemical properties. Explore their association with human infections and exceptions within the species.