Microbiology Quiz

Which of the following is a general characteristic of Citrobacter and Enterobacter?

• G+ve bacilli

• Non-motile

• Facultative anaerobe

• Spore forming

Where are Citrobacter and Enterobacter commonly found?

• Air

• Ocean

• Soil

• Ice

Which species of Citrobacter causes sepsis, meningitis, and brain abscess in neonates and infants?

• Citro. diversus

• Citro. koseri

• Citro amalonaticus

• Citro. freundii

What is the optimum temperature for the culture of Citrobacter and Enterobacter?

• 25°C

• 40°C

• 30°C

• 37°C

Which agar medium is used for the culture of Citrobacter and Enterobacter that shows pink color after 48 hours?

• Blood agar

• MacConkey agar

• Nutrient agar

• Sabouraud agar

What is the virulence factor of Enterobacter that prevents phagocytosis and induces an inflammatory response?

• Pili

• Capsule

• Flagella

• Ribosomes

Which species of Enterobacter causes pneumonia in ventilated patients?

• E. aerogenes

• E. coli

• E. faecalis

• E. cloacae

What is the color of the colonies produced by Citrobacter koseri on XLD media?

• Yellow with black center

• Pink

• Green

• White

Which of the following is a biochemical test that is positive for Citrobacter amalonaticus?

• Urease

• Motility

• Voges-Proskauer

• Indole

What is the treatment often effective in the Enterobacter infections?

• Tetracycline

• Penicillin

• Cephalosporin

• Aminoglycosides