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Background: Salmonella enterica subsp. enterica serovar Hartford (antigenic formula 6,7:y:e,n,x [z₆₇]) is a serovar of the O:7 (C₁) serogroup. Serovar Hartford was previously recovered from non-outbreak cattle herds. Serovar Hartford was found as highly persistent in all low-a_w food ingredients.

NCBI PD link for serovar Hartford: https://www.ncbi.nlm.nih.gov/pathogens/isolates/#(taxgroup_name:%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=Hartford%22)

Genetic characteristics: Serovar Hartford has been found to be polyphyletic with two lineages identified and one stand-alone singleton that does not cluster with any other Salmonella Hartford isolates. In a US study, serovar Hartford isolates were found to be pansusceptible to all antimicrobials tested using the Kirby-Bauer method. Additionally, all sixHartford isolates recovered from mesenteric lymph nodes on one of farms were indistinguishable based on pulsed-field gel electrophoresis analysis.

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Geographical distribution: Serovar Hartford has been found in the US, Canada, Australia, the UK, Hungary, and China.

Human Outbreaksoutbreaks: 

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1. https://www.liebertpub.com/doi/10.1089/fpd.2017.2303?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed
2. https://www.sciencedirect.com/science/article/pii/S0362028X22106150
3. https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2025.1547190/full
4. https://pmc.ncbi.nlm.nih.gov/articles/PMC4652083/
5. https://www.mdpi.com/2076-2607/11/2/403
6. https://www.jstor.org/stable/24320783
7. https://www.fda.gov/food/outbreaks-foodborne-illness/investigations-foodborne-illness-outbreaks
8. https://archive.cdc.gov/www_cdc_gov/salmonella/newport-05-14/index.html
9. https://archive.cdc.gov/#/details?url=https://www.cdc.gov/salmonella/2010/restaurant-chain-a-8-4-10.html
10. https://jamanetwork.com/journals/jama/fullarticle/188128