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Applied and Environmental Microbiology, October 2003, p. 6316-6320, Vol. 69, No. 10
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.10.6316-6320.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Comparison of Campylobacter Isolates from Poultry and Humans: Association between In Vitro Virulence Properties, Biotypes, and Pulsed-Field Gel Electrophoresis Clusters

Éric Nadeau, Serge Messier, and Sylvain Quessy*

Faculty of Veterinary Medicine, Université de Montréal, St-Hyacinthe, Québec, Canada J2S 7C6

Received 6 February 2003/ Accepted 9 July 2003

The in vitro virulence properties of 197 temporally and geographically related Campylobacter isolates from chicken broilers and humans were compared. Comparisons of the virulence properties associated with genotypes and biotypes were made. All isolates adhered to, and 63% invaded, INT-407 cells, whereas 13% were cytotoxic for CHO cells. CHO cell-cytotoxic extracts were also cytotoxic for INT-407 cells, but the sensitivity for Vero cells was variable. The proportion of isolates demonstrating a high invasiveness potential (>1,000 CFU ml-1) or Vero cell cytotoxicity was significantly higher for human than for poultry isolates. Invasiveness was associated with Campylobacter jejuni isolates of biotypes 1 and 2, whereas CHO and INT-407 cell cytotoxicity was associated with C. jejuni isolates of biotypes 3 and 4. Cytotoxic isolates were also clustered according to pulsed-field gel electrophoresis profiles.

* Corresponding author. Mailing address: Faculty of Veterinary Medicine, Université de Montréal, C.P. 5000, St-Hyacinthe, Québec, Canada J2S 7C6. Phone: (450) 773-8521. Fax: (450) 778-8113. E-mail: sylvain.quessy{at}umontreal.ca.

Applied and Environmental Microbiology, October 2003, p. 6316-6320, Vol. 69, No. 10
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.10.6316-6320.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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