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Salmonella Derby clonal spread from pork
Sylvia Valdezate1, Ana Vidal, Silvia Herrera-León
1Servicio de Bacteriologia C.N.M, Instituto de Salud Carlos III, Madrid, Spain. svaldezate@isciii.es
Emerging Infectious Diseases
|May 14, 2005
Summary
Genetic diversity of Salmonella Derby in Spain was analyzed using pulsed-field gel electrophoresis (PFGE). A dominant clone, prevalent in food and swine, was identified, suggesting a swine origin for this significant Salmonella Derby strain.
Area of Science:
- Microbiology
- Genetics
- Food Safety
Background:
- Salmonella enterica is a significant foodborne pathogen.
- The Derby serotype is a recognized variant of Salmonella enterica.
- Understanding the genetic diversity of Salmonella serotypes is crucial for public health.
Purpose of the Study:
- To investigate the genetic diversity of Salmonella enterica serotype Derby in Spain.
- To identify prevalent genetic profiles and potential sources of contamination.
Main Methods:
- Pulsed-field gel electrophoresis (PFGE) was employed to analyze the genetic relatedness of Salmonella Derby isolates.
- Isolates were obtained from human, food, and swine sources across Spain.
Main Results:
- Twenty-four distinct PFGE profiles were identified among the Salmonella Derby strains.
- A single major clone (clone 1) was the predominant profile, found in 19% of human, 52% of food, and 62% of swine isolates.
- Clone 1 was frequently detected in pork products, indicating a strong association with swine.
Conclusions:
- Swine are a likely primary reservoir for the dominant Salmonella Derby clone circulating in Spain.
- The findings highlight the importance of monitoring swine populations for Salmonella control to reduce human exposure through food products.