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Classification of Salmonella enterica serotypes from Australian poultry using repetitive sequence-based PCR

Authors


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Anthony Pavic, Birling Avian Laboratories, PO Box 111, Bringelly, NSW 2556, Australia. E-mail: Tony_Pavic@baiada.com.au

Abstract

Aims:  To evaluate a semi-automated repetitive extragenic palindromic sequence-based PCR (rep-PCR) system for the classification of Salmonella serotypes from Australian poultry.

Methods and Results:  Using a DNA fingerprint library within the DiversiLab® System, four separate databases were constructed (serogroup B, C, E and Other). These databases contained 483 serologically confirmed (reference laboratory) Salmonella isolates. A blinded set of Salmonella cultures (= 155) were typed by rep-PCR, matched against the internal library and compared with traditional serotyping. The predicted (Kullback–Leibler) serotype of 143 (92·3%) isolates matched traditional typing (< 0·05). Of the 12 (7·7%) remaining isolates, ten (6·5%) resulted in ‘No Match’, one (0·65%) was incorrectly matched to the library (Salm. subsp 1 ser 4,12:-:-), and the other (0·65%) was referenced as Salm. ser. Sofia, whereas rep-PCR and in-house serotyping concurred as Salmonella serovar Typhimurium. Financial analysis showed higher material cost (215%) and a lower labour component (47·5%) for rep-PCR compared with serotyping.

Conclusion:  The DiversiLab® System, with serogroup databases, was successfully implemented as an adjunct for reference serotyping of Salmonella enterica.

Significance and Impact of the Study:  The DiversiLab® System platform is a cost-effective and easy-to-use system, which can putatively determine Salmonella enterica serotypes within a few hours.

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