Background: Salmonella enterica subsp. enterica serovar Hartford (antigenic formula 6,7:y:e,n,x) is a serovar of the O:7 (C₁) serogroup. It has been isolated from a dairy-producing environment. 

Animal reservoir: Salmonella Hartford was found in chicken, calves, wild black bears, and dogs.

Geographical distribution: Serovar Hartford has been found in Hungary, China, and the U.S.

Human Outbreaks: 

¹ Salmonella Newport (20 cases), Salmonella Hartford (7 cases), or Salmonella Oranienburg (4 cases) 

² Salmonella Gaminara was also involved in this outbreak. 

Border rejections: There have been no recent border rejections linked to this serovar. 

Recalls: There have been no recent recalls linked to this serovar. 

Relevant links and references:

1. https://www.foodsafetynews.com/2023/03/fda-announces-new-salmonella-outbreak-other-investigations-continue/
2. https://archive.cdc.gov/www_cdc_gov/salmonella/newport-05-14/index.html
3. https://archive.cdc.gov/#/details?url=https://www.cdc.gov/salmonella/2010/restaurant-chain-a-8-4-10.html
4. https://jamanetwork.com/journals/jama/fullarticle/188128
5. https://www.jstor.org/stable/pdf/24320783.pdf?refreqid=excelsior%3Ada8966aa9c6b88949ad11ca86de2b59c&ab_segments=&origin=&initiator=&acceptTC=1
6. https://agris.fao.org/agris-search/search.do?recordID=CN9211229
7. https://www.liebertpub.com/doi/10.1089/fpd.2017.2303
8. https://www.mdpi.com/2076-2607/11/2/403
9. https://www.fda.gov/food/outbreaks-foodborne-illness/investigations-foodborne-illness-outbreaks
10. https://doi.org/10.1111/zph.13174