Which organism, which is oxidase positive, does not grow on TCBS agar, has the ability to decarboxylate lysine and ornithine but cannot utilize arginine, and would have the following co-lonial characteristics on sheep blood agar and MacConkey agar?

a. <-hemolytic and is a nonlactose fermen-ter
b. <-hemolytic and is a lactose fermenter
c. <-hemolytic and is a nonlactose fermen-ter
d. <-hemolytic and is a nonlactose fermenter


A
The organism is Aeromonas veronii biovar veronii. Most pathogenic strains of Aeromonas are <-hemolytic, except Aeromonas caviae, which is usually nonhemolytic. Both lethal factor (LF) and normalized LF (NLF) are found in this group.

Biology & Microbiology

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