Laboratory evaluation demonstrates distinct reaction vigor across Enterobacteriaceae using 3% hydrogen peroxide, highlighting its utility for rapid bacterial differentiation.
Key Points
To evaluate the efficacy of a standardized 3% hydrogen peroxide catalase test for differentiating genera within the family Enterobacteriaceae.
Tested clinical Enterobacteriaceae isolates using a standardized 3% hydrogen peroxide solution under clinical laboratory conditions.
Graded isolates based on the vigor and speed of bubbling reactions and assessed utility for identifying environmental and mixed-flora isolates.
Serratia, Proteus, and Providencia produced vigorous catalase reactions, whereas Salmonella and occasional isolates of Escherichia, Enterobacter, and Klebsiella showed moderate reactions.
Escherichia and Shigella isolates were predominantly nonreactive (with fewer than one-third reacting weakly), Enterobacter was largely weakly reactive, and Klebsiella isolates split equally between nonreactive and weakly reactive.
The assay reliably identified nonpigmented Serratia from hospital environments and detected nonspreading Proteus within mixed bacterial cultures.