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Background: Salmonella enterica subsp. enterica serovar Bredeney (antigenic formula 1,4,12,27:l,v:1,7 [z₄₀]) is a serovar of the O:4 (B) serogroup. S. Serovar Bredeney is a rare serovar, in the US, 405 cases were reported in humans between 1999-2009; in addition, 11 isolates were obtained from turkeys in the US during the same period. In Ireland, a different trend was observed, as it was reported as the third most common serovar during the years 1998-2000. Molecular characterization found that these were isolates closely related.

Genetic characteristics: In the Netherlands one isolate of S. serovar Bredeney was reported to harbor an IncN plasmid carrying the qnr genes (quinolone resistance genes). Among 112 isolates collected in Ireland, a high proportion (74%) of isolates were susceptible to all antimicrobial agents tested, while 21% showed resistance to both sulfonamide and trimethoprim, and a single isolate (0.9%) exhibited resistance to multiple (five) antimicrobial agents.

Animal reservoir: Serovar Bredeney appeared to be associated with poultry, at least in Ireland it was associated with chicken; and in the US with turkey. It was also unfrequently isolated from cattle, and pigs. 

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¹ Trader Joe’s Valencia Peanut Butter, manufactured by Sunland, Inc. of Portales, New Mexico, was the recalled product. This recall was caused by a multistate outbreak described above.

Relevant links:

1. http://www.cdc.gov/nationalsurveillance/PDFs/NationalSalmSurveillOverview_508.pdf
2. https://journals.asm.org/doi/full/10.1128/aem.68.1.181-186.2002
3. https://academic.oup.com/jac/article-abstract/64/6/1332/742644?redirectedFrom=fulltext&login=false
4. https://www.thermofisher.com/blog/food/salmonella-serotypes-present-in-turkey-samples/
5. https://pubmed.ncbi.nlm.nih.gov/10456719/
6. https://www.sciencedirect.com/science/article/abs/pii/S0163445303000409
7. https://www.sciencedirect.com/science/article/pii/S1326020023026742
8. https://webgate.ec.europa.eu/rasff-window/screen/notification/473167
9. https://webgate.ec.europa.eu/rasff-window/screen/notification/424002
10. https://archive.cdc.gov/www_cdc_gov/salmonella/bredeney-09-12/index.html

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