A weakly oxidase-positive,nonfermenting gram-negative rod is isolated from respiratory sample.Traditional biochemical reactions include: arginine dihydrolase-negative;lysine decarboxylase-positive;gelatin liquefaction-positive;oxidizes lactose and glucose.
A)B.cepacia
B)B.vesicularis
C)P.aeruginosa
D)Pandoraea spp.

Question

Quizplus · Accepted Answer

B.cepacia should be suspected whenever a nonfermentative organism that decarboxylates lysine is encountered.Lysine decarboxylation is positive in 80% of strains.Pandoraea spp.may be differentiated from B.cepacia by their failure to decarboxylate lysine and their inability to liquefy gelatin.P.aeruginosa is arginine dihydrolase-positive;lysine decarboxylase-negative,and does not oxidize lactose.B.vesicularis is lysine decarbosylase-negative and does not oxidize lactose.

A Weakly Oxidase-Positive,nonfermenting Gram-Negative Rod Is Isolated from Respiratory Sample