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 

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

Outbreaks: Outbreaks have been associated with S. Hartford. 

*Salmonella Gaminara was also involved in this outbreak. 

Relevant links and references:

1. https://www.cdc.gov/salmonella/2010/restaurant-chain-a-8-4-10.html
2. https://jamanetwork.com/journals/jama/fullarticle/188128
3. https://www.foodsafetynews.com/tag/salmonella-hartford/
4. https://www.jstor.org/stable/pdf/24320783.pdf?refreqid=excelsior%3Ada8966aa9c6b88949ad11ca86de2b59c&ab_segments=&origin=&initiator=&acceptTC=1
5. https://agris.fao.org/agris-search/search.do?recordID=CN9211229
6. https://www.liebertpub.com/doi/10.1089/fpd.2017.2303
7. https://www.mdpi.com/2076-2607/11/2/403