A weakly oxidase-positive, nonfermenting gram-negative rod is isolated from respiratory sample. Traditional biochemical reactions include: arginine dihydrolase-negative; lysine decarbox-ylase-positive; gelatin liquefaction-positive; oxidizes lactose and glucose

a. B. cepacia
b. B. vesicularis
c. P. aeruginosa
d. Pandoraea spp.


A
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 li-quefy 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.

Biology & Microbiology

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