Background: Salmonella enterica subsp. enterica serovar Newport (antigenic formula 6,8,20:e,h:1,2 ) is a serovar of the O:8 (C2-C3) serogroup. This serovar is one of top ten Salmonella serovars associated with human salmonellosis in North America. According to the National Veterinary Services Laboratories (NVSL), S. Newport became one of the top ten most frequently identified Salmonella serotypes from U.S. cattle from July 1998 through June 1999. Other findings also show that multidrug-resistant S. Newport has recently been spreading on an epidemic scale in both humans and animals throughout the United States. Based on the sequence analyses of the integrons, these isolates contained aadA, which confers resistance to streptomycin, or aadA and dhfr, which confer resistance to trimethoprim-sulfamethoxazole. The persistent strain of S. Newport (REPJJP01) has been identified and linked to travel to mexico, beef, and soft cheese.

Animal reservoir: Salmonella Newport was found in cattle, chicken, pig, horse, fish and goat. 

Geographical distribution: Serovar Newport has been mainly found in North America, and Europe. 

Outbreaks: Outbreaks have been associated with S. Newport. 

YearLocationAssociated SourceNumber of Cases
1995-1996USAlfalfa >133
1999USMangoes79
2002US: Multi-stateTomatoes510
2002US: Multi-stateGround beef47
2004USLettuce97
2005-2006US: Multi-stateRaw tomatoes187
2006USWatermelon20
2012US: Multi-stateCantaloupeSalmonella Typhimurium sickened 228; Salmonella Newport sickened 33 people
2014US: Multi-stateCucumber275
2016-2017US: Multi-stateGround beef106
2017US: Multi-stateImported maradol papayas4 (Salmonella Infantis was involved)
2018US: KSTomatoes14
2018US: Multi-stateFrozen shredded coconut 27 (Salmonella I 4,[5],12:b:- was also involved)
2018France & ScotlandRaw goats' milk cheese

France: 147

Scotland: 6

2018-2019US: Multi-stateGround beef produced by JBS Tolleson, Inc403
2019US: Multi-stateFrozen, ground tuna from JK Fish of Vietnam13 
2019US: Multi-stateTuna15
2019US: Multi-statePig ear treats for dogs93 (Three serovars were involved: Infantis, London, and Newport)
2019Sweden Frozen crayfish from China33
2020US & CanadaRed onions

US: 1127

Canada: 515

2020France Raw or rare horse meat20
2021USInfant formula4 (3 of them were associated with Cronobacter sakazakii infections)
2021US: Multi-stateBeef75 (associated with REPJJP01)
2022US: Multi-stateBeef22 (associated with REPJJP01)


Relevant links and references:

  1. https://www.fda.gov/food/outbreaks-foodborne-illness/factors-potentially-contributing-contamination-red-onions-implicated-summer-2020-outbreak-salmonella
  2. https://www.cdc.gov/salmonella/general/technical/newport.html
  3. https://www.cdc.gov/salmonella/newport-07-20/index.html
  4. https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-salmonella-newport-frozen-ground-tuna-april-2019
  5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC309039/
  6. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5125a1.htm
  7. https://jamanetwork.com/journals/jama/article-abstract/193406
  8. https://www.addl.purdue.edu/newsletters/2004/summer/salmnewp.htm
  9. https://pubmed.ncbi.nlm.nih.gov/36382397/
  10. https://www.cdc.gov/mmwr/volumes/67/wr/mm6715a2.htm#F1_down
  11. https://www.cdc.gov/salmonella/newport-10-18/index.html
  12. https://www.aphis.usda.gov/aphis/ourfocus/animalhealth/animal-and-animal-product-import-information/organisms-vectors/livestock-poultry-pathogens
  13. https://www.fsis.usda.gov/sites/default/files/media_file/2022-06/Newport_AAR_20220519_cln.pdf
  14. https://www.canada.ca/en/public-health/services/public-health-notices/2020/outbreak-salmonella-infections-under-investigation.html
  15. https://www.foodsafetynews.com/tag/salmonella-newport/
  16. https://www.sciencedirect.com/science/article/abs/pii/S016816051830638X
  17. https://www.sciencedirect.com/science/article/pii/S0362028X22086392#bb0210
  18. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5635a3.htm
  19. https://www.liebertpub.com/doi/pdf/10.1089/fpd.2008.0232
  20. https://www.cdc.gov/salmonella/newport-09-17/index.html
  21. https://www.cambridge.org/core/journals/epidemiology-and-infection/article/outbreak-of-salmonella-newport-associated-with-internationally-distributed-raw-goats-milk-cheese-france-2018/528E4E70FB25CDBB293627227740E39D
  22. https://www.pritzkerlaw.com/personal-injury/2020/salmonella-newport-outbreaks-beef-papayas-melon-cucumbers-tuna-chia-powder-and-coconut/
  23. https://www.cdc.gov/mmwr/volumes/72/wr/mm7245a3.htm
  24. https://www.cdc.gov/ncezid/dfwed/outbreak-response/rep-strains/repjjp01.html#:~:text=REPJJP01%20is%20a%20persistent%2C%20multidrug,to%20PulseNet%20in%20late%202015.
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