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Journal of Clinical Microbiology, May 2000, p. 1860-1865, Vol. 38, No. 5
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Genetic Relatedness of Salmonella Isolates from Nondomestic Birds in Southeastern United States

Charlene R. Hudson,1 Charlotte Quist,2 Margie D. Lee,3 Kathleen Keyes,3 Sara V. Dodson,1 Cesar Morales,1 Susan Sanchez,2 David G. White,4 and John J. Maurer1,*

Departments of Avian Medicine1 and Medical Microbiology and Parasitology3 and Athens Diagnostic Laboratory,2 College of Veterinary Medicine, The University of Georgia, Athens, Georgia 30602, and Center for Veterinary Medicine, The Food and Drug Administration, Laurel, Maryland 207084

Received 30 November 1999/Returned for modification 8 January 2000/Accepted 1 March 2000

Salmonella infections have been implicated in large-scale die-offs of wild birds in the United States. Although we know quite a bit about the epidemiology of Salmonella infection among domestic fowl, we know little about the incidence, epidemiology, and genetic relatedness of salmonellae in nondomestic birds. To gain further insight into salmonellae in these hosts, 22 Salmonella isolates from diseased nondomestic birds were screened for the presence of virulence and antibiotic resistance-associated genes and compared genetically using pulsed-field gel electrophoresis (PFGE) and random amplified polymorphic DNA analysis. Of the 22 Salmonella isolates examined, 15 were positive for the invasion gene invA and the virulence plasmid-associated genes spvC and pef. Most (15 of 22) were generally sensitive to antibiotics. However, two Salmonella isolates from pet birds were identified as Salmonella enterica serovar Typhimurium DT104. Despite the general susceptibility of these Salmonella isolates to most antimicrobial agents, antibiotic resistance-associated genes intI1, merA, and aadA1 were identified in a number of these isolates. Five distinct XbaI and nine distinct BlnI DNA patterns were observed for the 22 Salmonella isolates typed by PFGE. PFGE analysis determined that Salmonella isolates from passerines in Georgia and Wyoming were genetically related.

* Corresponding author. Mailing address: The Department of Avian Medicine, The University of Georgia, 953 College Station Rd., Athens, GA 30602. Phone: (706) 542-5071. Fax: (706) 542-5630. E-mail: jmaurer{at}calc.vet.uga.edu.

Journal of Clinical Microbiology, May 2000, p. 1860-1865, Vol. 38, No. 5
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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