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Journal of Clinical Microbiology, November 2000, p. 3937-3941, Vol. 38, No. 11
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Recognition of Two Novel Phenons of the Genus Acinetobacter among Non-Glucose-Acidifying Isolates from Human Specimens

Alexandr Nemec,1,* Lenie Dijkshoorn,2 and Petr Jezek3

National Institute of Public Health, Prague,1 and Department of Clinical Microbiology, General Hospital, Príbram,3 Czech Republic, and Department of Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands2

Received 28 March 2000/Returned for modification 13 July 2000/Accepted 21 August 2000

Genomic species diversity among 147 Acinetobacter clinical isolates not belonging to the A. calcoaceticus- A. baumannii (ACB) complex was investigated by phenotypic and genotypic identification methods. The isolates were obtained between 1991 and 1999 from numerous diagnostic laboratories in the Czech Republic and were studied by numerical probabilistic identification using two biochemical frequency matrices and amplified rDNA restriction analysis (ARDRA). Their final identification was derived from the combined phenotypic and ARDRA results. In total, 102 isolates were unambiguously (n = 89) or presumptively (n = 13) identified as A. lwoffii (n = 63), genomic species 13BJ/14TU (n = 9), A. johnsonii (n = 7), A. haemolyticus (n = 6), A. junii (n = 5), and other genomic species (n < 5 isolates each). Forty-five isolates could not be identified as belonging to any described species. Among the unidentified isolates two large groups of non-glucose-acidifying, nonhemolytic, and non-gelatinase-producing isolates were distinguished. These groups, designated phenon 1 (n = 17) and phenon 2 (n = 15), had distinctive phenotypic features and novel ARDRA profiles, which suggests that they represent hitherto undescribed Acinetobacter species. Phenon 2 included mainly clinically insignificant isolates from outpatients, while phenon 1 comprised clinically relevant isolates mostly from the blood of hospitalized patients, and its precise taxonomic definition may therefore be of medical importance. Overall, the development of practical methods for identification required for the elucidation of the biological significance of the (genomic) species within the genus Acinetobacter remains a challenging task.

* Corresponding author. Mailing address: National Institute of Public Health, Srobárova 48, 100 42 Prague, Czech Republic. Phone: (420) 2 6708 2266. Fax: (420) 2 72700428. E-mail: anemec{at}szu.sz.

Journal of Clinical Microbiology, November 2000, p. 3937-3941, Vol. 38, No. 11
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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