MCQ – 86632

Correct Answer � C Explanation

 Ans. is ‘c’ i.e., Normal flora in human 

•  Chromobacterium is a gram-negative curved or rod shaped bacterium.

• It is a facultative anaerobe and is motile by polar & peritrichous flagella.

• There is only one species recognized within the genus, i.e. C violaceum.

• It is so named because it produces a violet-colored pigment known as violacein.

C violaceum is the only microorganism that produces a violet pigment and can cause human infection

• The organism is found in water, soil and animals but not a part of normal flora of humans.

• Infection usually occurs after open traumatic wound and can cause :

• Infections have a high rate of mortality even after treatment.

• Virulence is related to the production of endotoxin that helps the bacterial cells evade phagocytosis.

• C violaceum is susceptible to tetracycline and gentamicin but resistant to cephalosporins.