catalase neg staph?

Linda Nims -Micro lnims at NUMEX.UNM.EDU
Fri Feb 7 09:34:56 EST 1997


We periodically receive a catalase-negative staph aureus for 
confirmation.  The organisms look, smell and have the biochemical 
reactions of s.a., but are catalase negtive.  

Linda Nims
New Mexico State Laboratory

On 7 Feb 1997, N S Uyeda wrote:

> This gram pos cocci has been isolated twice from midstream and cath urine
> of same individual. The very beta, non-sticky, colony resembles Staph; on
> gram stain too. It's coagulase and thermonuclease positive, beta lactam
> neg. Vitek ID is S. aureus if catalase pos.; if catalase neg the Vitek
> calls it strep group B, or unidentified.
> 
> It's PYR pos but fails all other tests for Strep group A or enterococci
> (latex, SxT disk). Only problem is that it's repeatedly catalase neg on
> all media.
> Any ideas?
> Sue Uyeda
> Dominican Hosp. Microbiology
> Santa Cruz, CA
> 
> 



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