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Journal of Clinical Microbiology, March 2000, p. 1302-1304, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Potential Errors in Recognition of Erysipelothrix rhusiopathiae

Sherry A. Dunbar1,2,dagger and Jill E. Clarridge III1,2,3,*

Department of Pathology1 and Department of Microbiology and Immunology,3 Baylor College of Medicine, and Pathology and Laboratory Medicine Service, Veterans Affairs Medical Center,2 Houston, Texas

Received 23 June 1999/Returned for modification 21 August 1999/Accepted 13 November 1999

Here we describe four isolations of Erysipelothrix rhusiopathiae associated with polyarthralgia and renal failure, septic arthritis, classic erysipeloid, and peritonitis. Although the biochemical identification was straightforward in each case, recognition presented a challenge to the clinical microbiologist, since in three cases E. rhusiopathiae was not initially considered due to unusual clinical presentations, in two cases the significance might not have been appreciated because growth was in broth only, and in one case the infection was thought to be polymicrobic. Because the Gram stain can be confusing, abbreviated identification schemes that do not include testing for H2S production could allow E. rhusiopathiae isolates to be misidentified as Lactobacillus spp. or Enterococcus spp. in atypical infections.


* Corresponding author. Mailing address: Pathology and Laboratory Medicine Service (113), Veterans Affairs Medical Center, 2002 Holcombe Blvd., Houston, TX 77030. Phone: (713) 794-7336. Fax: (713) 794-7657. E-mail: jillc{at}bcm.tmc.edu.

dagger Present address: Luminex, Austin, TX


Journal of Clinical Microbiology, March 2000, p. 1302-1304, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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