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, dog, and goat. 

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

Human outbreaks: Multiple human outbreaks linked to serovar Newport have been reported with the majority occurring in the US. Below are examples. 

YearLocationAssociated sourceNumber of cases
2022US: multistateBeef (suspected)122
2021US: multistateInfant formula24
2021US: multistateBeef (suspected)375
2020US: multistate & CanadaRed onions4

1,642

2020France Raw or rare horse meat20
2019US: multistateFrozen, ground tuna15 
2019US: multistatePig ear treats for dogs5154
2019Sweden Frozen crayfish from China33
2018-2019US: multistateGround beef403
2018US: KSTomatoes10 (confirmed) and 55 (probable)
2018US: multistateFrozen shredded coconut6 27
2018France & ScotlandRaw goats' milk cheese7

153

2017US: multistateMaradol papayas84
2016-2017US: multistateGround beef106
2014US: multistateCucumber275
2012US: multistateCantaloupe9261
2006US: NYWatermelon20
2005-2006US: multistate

Raw tomatoes10

459
2004USLettuce368
2002US: multistateTomatoes510
2002US: multistateRaw or undercooked ground beef47
1999USMango78
1995-1996US, Canada, other internationalAlfalfa sprouts202

1 A REP strain (REPJJP01) was identified as the outbreak strain.

2 A total of four cases were reported [Cronobacter sakazakii (3) and Salmonella Newport (1)]. 

3 A REP strain (REPJJP01) was identified as the outbreak strain.

4 US reported 1,127 cases, while Canada reported 515 cases.

5 Salmonella I 4,[5],12:i:-, Cerro, Derby, Infantis, London, Newport, and Rissen were involved in this outbreak. The case number (i.e., 154) is not specific to Salmonella Newport infections. 

6 The infections included Salmonella I 4,[5],12:b:- (26 cases) and Salmonella Newport (1 case).

7 France reported 147 cases, while Scotland reported 6 cases.

8 The infections included Salmonella Newport (3 cases) and Salmonella Infantis (1 case).

9 The infections included Salmonella Typhimurium (228 cases) and Salmonella Newport (33 cases).

10 The infections included Salmonella Newport (197 cases), Typhimurium (190 cases), and Braenderup (72 cases). 

Border rejections: Multiple border rejections linked to this serovar have been reported and they are mainly associated with poultry or poultry products. Below are some examples:

Year

Exporting country

Importing country

Associated source

Product category

2025PolandItalyFrozen duck1Poultry meat and poultry meat products
2025PolandItalyChicken and turkey kebabPoultry meat and poultry meat products
2021BrazilGermanyBlack pepper2Herbs and spices
2020PolandItalyFrozen marinated chicken inner filletsPoultry meat and poultry meat products
2020IndiaGermanyDog chews (dried tripes)3Feed materials

1 Salmonella Enteritidis and Newport were found. 

2 Salmonella Javiana, Newport, Poona and Abaetetuba were found.

3 Salmonella Typhimurium and Newport were found.  

Recalls: Multiple recalls linked to this serovar have been reported and they are associated with a variety of food commodities. Below are some examples:

YearLocationRecalled foodType
2023Poland, ItalyPekin duck fillet from Poland1Poultry meat and poultry meat products
2023GermanySpice mixtures (onion powder)Herbs and spices
2022PolandDried chicken feetPet food
2020US: multistateOnions2Fruits and vegetables
2018US: multistateRaw beef products3Meat and meat products (other than poultry)
2012US: multistateCantaloupe4Fruits and vegetables

1 Salmonella Enteritidis and Newport were found. 

2 This recall was caused by a multistate outbreak described above. Thomson International, Inc. and other companies voluntarily issued recalls of their red, yellow, white, and sweet yellow onions. 

3 This recall was caused by a multistate outbreak described above. JBS Tolleson, Inc., a Tolleson, Ariz. establishment, issued a recall of approximately 12,093,271 pounds of non-intact raw beef products. 

4 This recall was caused by a multistate outbreak involving Salmonella Typhimurium and Newport as described above. Chamberlain Farms Produce, Inc. of Owensville, Indiana voluntarily issued a recall of cantaloupe grown on its farm. 

Relevant links:

  1. https://pmc.ncbi.nlm.nih.gov/articles/PMC10651324/#:~:text=Outbreak%20Investigations&text=A%20second%20multistate%20outbreak%20that,ground%20beef%20from%20a%20patient.
  2. https://dpbh.nv.gov/uploadedFiles/dpbhnvgov/content/Resources/Update%20TB_FDA%20Recall%20on%20Infant%20Formula%20030122.pdf
  3. https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-salmonella-newport-red-onions-july-2020
  4. https://pmc.ncbi.nlm.nih.gov/articles/PMC11450499/#:~:text=In%20July%202020%2C%20a%20Salmonella,2020%20to%2029%20August%202020
  5. https://www.foodsafetynews.com/2020/10/salmonella-in-horse-meat-linked-to-two-deaths-in-france/
  6. https://archive.cdc.gov/www_cdc_gov/salmonella/newport-04-19/index.html
  7. https://www.fda.gov/animal-veterinary/outbreaks-and-advisories/fda-investigates-contaminated-pig-ear-pet-treats-connected-human-salmonella-infections
  8. https://pmc.ncbi.nlm.nih.gov/articles/PMC9164673/#:~:text=In%20autumn%202019%2C%20the%20Public,source%20and%20prevent%20further%20cases
  9. https://archive.cdc.gov/#/details?url=https://www.cdc.gov/salmonella/newport-10-18/index.html
  10. https://www.kdhe.ks.gov/ArchiveCenter/ViewFile/Item/2781
  11. https://archive.cdc.gov/www_cdc_gov/salmonella/coconut-01-18/index.html
  12. 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
  13. https://outbreakdatabase.com/outbreaks/2017-multistate-outbreak-of-salmonella-newport-and-salmonella-infantis-linked-to-maradol-papayas
  14. https://www.fsis.usda.gov/sites/default/files/media_file/documents/Newport_AAR_2022072722_cln.pdf
  15. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6406a3.htm#:~:text=In%20August%202014%2C%20PulseNet%2C%20the,pattern%20
  16. https://archive.cdc.gov/www_cdc_gov/salmonella/typhimurium-cantaloupe-08-12/index.html
  17. https://outbreakdatabase.com/outbreaks/2006-outbreak-of-salmonella-newport-at-a-restaurant-linked-to-watermelon-new-york
  18. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5635a3.htm
  19. https://www.cidrap.umn.edu/foodborne-disease/uk-salmonella-outbreak-linked-lettuce
  20. https://pmc.ncbi.nlm.nih.gov/articles/PMC2870807/#:~:text=Salmonella%20Newport%20causes%20more%20than,510%20patients%20in%2026%20states
  21. https://pubmed.ncbi.nlm.nih.gov/12118534/
  22. https://pubmed.ncbi.nlm.nih.gov/14689335/
  23. https://outbreakdatabase.com/outbreaks/1995-outbreak-of-salmonella-newport-associated-with-alfalfa-sprouts
  24. https://webgate.ec.europa.eu/rasff-window/screen/notification/745388
  25. https://webgate.ec.europa.eu/rasff-window/screen/notification/737443
  26. https://webgate.ec.europa.eu/rasff-window/screen/notification/522132
  27. https://webgate.ec.europa.eu/rasff-window/screen/notification/425465
  28. https://webgate.ec.europa.eu/rasff-window/screen/notification/423186
  29. https://webgate.ec.europa.eu/rasff-window/screen/notification/625006
  30. https://webgate.ec.europa.eu/rasff-window/screen/notification/608601
  31. https://webgate.ec.europa.eu/rasff-window/screen/notification/555203
  32. https://archive.cdc.gov/www_cdc_gov/salmonella/newport-07-20/updates.html
  33. https://www.fsis.usda.gov/recalls-alerts/jbs-tolleson-inc--recalls-raw-beef-products-due-possible-salmonella-newport
  34. https://outbreakdatabase.com/outbreaks/2012-multistate-outbreak-of-salmonella-newport-linked-to-cantaloupe