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Please tell me can gram-negative bacteria test be positive in a catalase test, even if catalase tests are meant for gram-positive bacteria?

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Dr. Stephen Scholand
Internal Medicine - Infectious Disease

In brief: Catalase enzyme

Yes -many, many bacteria possess catalase.
Classically the catalase test was used to distinguish Staph (+) from Strep (-), but there is a long list of bacteria that have it... includin Listeria, C diphtheriae, Burkholderia cepacia, Nocardia, the family Enterobacteriaceae (Citrobacter, E. coli, Enterobacter, Klebsiella, Shigella, Yersinia, Proteus, Salmonella, Serratia), Pseudomonas etc.

In brief: Catalase enzyme

Yes -many, many bacteria possess catalase.
Classically the catalase test was used to distinguish Staph (+) from Strep (-), but there is a long list of bacteria that have it... includin Listeria, C diphtheriae, Burkholderia cepacia, Nocardia, the family Enterobacteriaceae (Citrobacter, E. coli, Enterobacter, Klebsiella, Shigella, Yersinia, Proteus, Salmonella, Serratia), Pseudomonas etc.
Dr. Stephen Scholand
Dr. Stephen Scholand
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