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Journal of Clinical Microbiology, March 2001, p. 930-935, Vol. 39, No. 3
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.3.930-935.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Clinical Significance and Taxonomy of Actinobacillus hominis

Alice Friis-Møller,1 Jens Jørgen Christensen,2 Vivian Fussing,3 Annemarie Hesselbjerg,2 Jytte Christiansen,2 and Brita Bruun2,*

Department of Clinical Microbiology, H:S Hvidovre Hospital, DK-2650 Hvidovre,1 and Department of Clinical Microbiology2 and Department of Gastrointestinal Infections,3 Statens Serum Institut, DK-2300 Copenhagen, Denmark

Received 27 September 2000/Returned for modification 14 November 2000/Accepted 20 December 2000

Clinical findings in 36 immunosuppressed patients with lower respiratory tract infection or bacteremia with Actinobacillus hominis are described. Animal contact was only recorded for three patients; nine patients died despite appropriate antimicrobial treatment. Although infections with this microorganism seem to be rare, the fact that 37 of 46 strains characterized in this study have been found in Copenhagen indicates that under-reporting may occur. A. hominis is phenotypically relatively homogeneous but can be difficult to differentiate from other Actinobacillus species unless extensive biochemical testing is performed. Mannose-positive strains of A. hominis are especially difficult to differentiate from A. equuli. Attempts to identify A. hominis by automatic identification systems may lead to misidentifications. Ribotyping and DNA-DNA hybridization data show that A. hominis is a homogeneous species clearly separated from other species within the genus Actinobacillus.

* Corresponding author. Mailing address: Department of Clinical Microbiology, Statens Serum Institut, 5 Artillerivej, DK-2300 Copenhagen S, Denmark. Phone: 45-32-68-33-71. Fax: 45-32-68-38-73. E-mail: BGB{at}SSI.DK.

Journal of Clinical Microbiology, March 2001, p. 930-935, Vol. 39, No. 3
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.3.930-935.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.