The Open Veterinary Science Journal


ISSN: 1874-3188 ― Volume 9, 2015

Epidemiological Analysis of Salmonella Enterica Serovar Typhimurium and Serovar 1,4,[5],12:i:- Isolates Determined by Pulsed Field Gel Electrophoresis and Antibiotic Susceptibility: Comparison of Isolates from Broiler Chickens, Humans and the Environment in Reunion Island

The Open Veterinary Science Journal, 2015, 9: 10-18

Isabelle Henry, Marianne Chemaly, Sophie Granier, Françoise Lalande, Céline Courtillon, Gilles Salvat, Eric Cardinale

College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 1601 Campus Delivery, Fort Collins, CO 80523-1601, USA.

Electronic publication date 30/4/2015
[DOI: 10.2174/1874318801509010010]


Salmonella enterica ssp. enterica is a leading cause of bacterial food-borne disease outbreaks worldwide and is also an economic burden particularly in Reunion Island because its population consumes large amounts of chicken and cooks 100% chicken sausages (35 kg per capita per year).

The aim of this study was to investigate the epidemiology of Salmonella Typhimurium and Salmonella 1,4,[5],12:i:- from broiler chickens, humans and the environment by using pulsed field gel electrophoresis (PFGE) and antibiotic susceptibility and to assess the significance of broiler chicken meat as a source of human infection.

A total of 157 Salmonella Typhimurium and 19 S. I 4,[5],12:i:- were collected and isolated from broiler chickens, humans and the environment between October 2007 and January 2009. The PFGE of Xba1 digested chromosomal DNA gave 30 distinct profiles for Salmonella Typhimurium and S. 1,4,[5],12:i:-. Salmonella Typhimurium was characterized by a main pulsotype (B54) and accounted for 32% of all isolates. This pulsotype included isolates from many sources such as broiler chickens, poultry houses, slaughterhouses, other animal species (ducks, pigs and rodents) and humans, suggesting that it had already colonized every step of the food chain. Antibiotic susceptibility tests showed that most isolates were resistant to ampicillin, streptomycin, sulfonamides and tetracycline.

The similarity of PFGE profiles of isolates from various sources and particularly from poultry and humans underlined possible transmission of Salmonella from contaminated broiler meat, but most of the isolates remained drug-sensitive. Significance and impact of study: Efforts are needed to eliminate Salmonella from poultry meat destined for human consumption. This study has also shown the importance of monitoring antimicrobial resistance in bacteria associated with animals and humans.

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