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Journal of Clinical Microbiology, November 1999, p. 3647-3653, Vol. 37, No. 11
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Isolation, Identification, and Molecular Characterization of Strains of Photorhabdus luminescens from Infected Humans in Australia

Margaret M. Peel,1,* David A. Alfredson,2 John G. Gerrard,2 Jennifer M. Davis,1 Jennifer M. Robson,3 Rodney J. McDougall,3 Barry L. Scullie,4 and Raymond J. Akhurst5

Microbiological Diagnostic Unit, The University of Melbourne, Parkville, Victoria 3052,1 Gold Coast Hospital, Southport, Queensland 4215,2 Sullivan Nicolaides Pathology, Taringa, Queensland 4068,3 Wangaratta District Base Hospital Pathology Service (Melbourne Pathology), Wangaratta, Victoria 3677,4 and Commonwealth Scientific and Industrial Research Organisation (CSIRO) Entomology, Canberra, Australian Capital Territory 2601,5 Australia

Received 5 April 1999/Returned for modification 4 June 1999/Accepted 9 August 1999

We describe the isolation of Photorhabdus (Xenorhabdus) luminescens from four Australian patients: two with multiple skin lesions, one with bacteremia only, and one with disseminated infection. One of the patients had multiple skin lesions following the bite of a spider, while the lesions in the other patient were possibly associated with a spider bite. The source of infection for the remaining two patients is unknown. As a member of the family Enterobacteriaceae, P. luminescens is unusual in that it fails to reduce nitrate and ferments only glucose and mannose. It gives negative reactions for lysine decarboxylase, arginine dihydrolase, and ornithine decarboxylase (Moeller). The species is motile, utilizes citrate, hydrolyzes urea, and usually produces a unique type of annular hemolysis on sheep blood agar plates incubated at 25°C. A weak bioluminescence is the defining characteristic. P. luminescens is an insect pathogen and is symbiotically associated with entomopathogenic nematodes. Its isolation from human clinical specimens has been reported previously from the United States. Restriction fragment length polymorphism-PCR analysis of the 16S rRNA gene demonstrated a high level of similarity among the Australian clinical strains and significant differences between the Australian clinical strains and the U.S. clinical strains. However, numerical analyses of the data suggest that the two groups of clinical strains are more similar to each other than they are to the symbiotic strains found in nematodes. This is the first report of the isolation of P. luminescens from infected humans in Australia and the second report of the isolation of this species from infected humans worldwide.

* Corresponding author. Mailing address: Microbiological Diagnostic Unit, Department of Microbiology and Immunology, The University of Melbourne, Parkville, Victoria 3052, Australia. Phone: 61 3 9344 7736. Fax: 61 3 9344 7833. E-mail: m.peel{at}microbiology.unimelb.edu.au.

Journal of Clinical Microbiology, November 1999, p. 3647-3653, Vol. 37, No. 11
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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