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ARS Home » Southeast Area » Athens, Georgia » U.S. National Poultry Research Center » Egg and Poultry Production Safety Research Unit » Research » Publications at this Location » Publication #314624

Title: Phenotypic, Genotypic and Pathogenicity assessment of Salmonella Infantis strains isolated from poultry

Author
item SANCHEZ-INGUNZA, ROXANA - FORMER ARS EMPLOYEE
item MADSEN, MELISSA - COLLABORATOR
item Guard, Jean
item EL-ATTRACHE, JOHN - COLLABORATOR

Submitted to: Western Poultry Disease Conference
Publication Type: Abstract Only
Publication Acceptance Date: 11/18/2014
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Salmonella enterica subspecies enterica serovar Infantis has been associated with human illnesslinked to contamination of poultry products. In the US, Salmonella Infantis has been recently associated to human cases of salmonellosis linked to live poultry. The presence of multidrug resistant strains circulating in poultry as well as the emergence of this serotype possibly associated to interventions directed to other Salmonella serotypes around the world supports the relevance of Salmonella Infantis in public health. The present study evaluated the phenotypic, genotypic and pathogenic characteristics of Salmonella Infantis strains isolated from commercial poultry in the US. Phenotype microarray, including antibiotic susceptibility profiles, genome analysis and virulence assessment in poultry were performed and results are presented and discussed. Even though some differences in virulence were observed, high challenge doses of Salmonella Infantis were required for colonization of chicken internal organs with no mortality or any other clinical sign associated with infection. Salmonella enterica subsp. enterica serovar Infantis is classified as O:7 (C1) serogroup under the Le Minor-Kauffmann-White scheme. This Salmonella serovar has being associated to salmonellosis in humans linked to food products (1,4). In the U.S. humaninfections were mainly linked to direct contact with live poultry (2). The emergence on multidrug-resistant (MDR) strains has been reported (3) therefore representing a continuous hazard to public health. This study investigated the phenotypic, genotypic and pathogenicity characteristics of Salmonella Infantis isolated from poultry environments in the U.S and assessed their antimicrobial susceptibility. The purpose of this study was to contribute to the understanding of Salmonella Infantis on specific characteristics that may be used to control the dissemination and infection.