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Eukaryotic Cell, September 2008, p. 1475-1486, Vol. 7, No. 9
1535-9778/08/$08.00+0     doi:10.1128/EC.00162-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Molecular Phylogenetic Analysis of a Geographically and Temporally Matched Set of Candida albicans Isolates from Humans and Nonmigratory Wildlife in Central Illinois {triangledown}

Lauren Wrobel,1 Julia K. Whittington,2 Claude Pujol,3 Soon-Hwan Oh,1 Marilyn O. Ruiz,1 Michael A. Pfaller,4 Daniel J. Diekema,4,5 David R. Soll,3 and Lois L. Hoyer1*

Departments of Pathobiology,1 Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61802,2 Departments of Biological Sciences,3 Pathology,4 Internal Medicine, University of Iowa, Iowa City, Iowa 522425

Received 8 May 2008/ Accepted 3 July 2008

This study explored whether wildlife species serve as the reservoir for human Candida albicans strains in a given geographic area. C. albicans isolates were collected from nonmigratory wildlife admitted to the University of Illinois Wildlife Medical Clinic. A geographically and temporally matched set of C. albicans oral isolates was collected from healthy human volunteers. Multilocus sequence typing was used to assign strains to genetic clades. Clade 1 isolates, particularly diploid sequence type 69 (DST 69), were most common in humans. Clade 1 strains were less frequently recovered from wildlife, while clade 8 strains, particularly DST 90, were overrepresented in the wildlife collection. All instances where a wildlife and human isolate shared the same DST occurred within clade 1. Clade distributions between human and wildlife isolates were significantly different, demonstrating population isolation between the groups. These differences may indicate limited strain transfer between groups or differential selection of C. albicans isolates in humans and wildlife. Wildlife strains had an amphotericin B MIC significantly lower than that of human isolates; strains with increased susceptibility were from several clades. C. albicans isolates were collected from domestic animals to provide comparisons with human and wildlife data sets. C. albicans isolation from canine and feline oral and anal swabs was infrequent; companion animal isolates were closely related to clade 1 human isolates. Collectively, the data suggest a greater likelihood of C. albicans transfer from humans to animals than from animals to humans. The nontransient human population may maintain the connection between geography and the C. albicans genetic groups recovered from humans.

* Corresponding author. Mailing address: Department of Pathobiology, University of Illinois, 2522 VMBSB, 2001 S. Lincoln Avenue, Urbana, IL 61802. Phone: (217) 333-5043. Fax: (217) 244-7421. E-mail: lhoyer{at}illinois.edu

{triangledown} Published ahead of print on 11 July 2008.

Eukaryotic Cell, September 2008, p. 1475-1486, Vol. 7, No. 9
1535-9778/08/$08.00+0     doi:10.1128/EC.00162-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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