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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. serovar 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. serovar 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 dhfrUS. 

Genetic characteristics: 

Animal reservoir: Cattle is the main reservoir for serovar Newport. This serovar was also isolated from other animals, such as pigs, poultry, horses, dogs, and pigeons, 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 reported worldwide but is primarily found in North and Latin 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. 

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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/PMC3008538/
2. https://pubmed.ncbi.nlm.nih.gov/21492021/#:~:text=Salmonella%20serovars%20Newport%20(mainly%20observed,American%20and%20European%20countries)%20were
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC10651324/#:~:text=Outbreak%20Investigations&text=A%20second%20multistate%20outbreak%20that,ground%20beef%20from%20a%20patient.
4. https://dpbh.nv.gov/uploadedFiles/dpbhnvgov/content/Resources/Update%20TB_FDA%20Recall%20on%20Infant%20Formula%20030122.pdf
5. https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-salmonella-newport-red-onions-july-2020
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC11450499/#:~:text=In%20July%202020%2C%20a%20Salmonella,2020%20to%2029%20August%202020
7. https://www.foodsafetynews.com/2020/10/salmonella-in-horse-meat-linked-to-two-deaths-in-france/
8. https://archive.cdc.gov/www_cdc_gov/salmonella/newport-04-19/index.html
9. https://www.fda.gov/animal-veterinary/outbreaks-and-advisories/fda-investigates-contaminated-pig-ear-pet-treats-connected-human-salmonella-infections
10. https://pmc.ncbi.nlm.nih.gov/articles/PMC9164673/#:~:text=In%20autumn%202019%2C%20the%20Public,source%20and%20prevent%20further%20cases
11. https://archive.cdc.gov/#/details?url=https://www.cdc.gov/salmonella/newport-10-18/index.html
12. https://www.kdhe.ks.gov/ArchiveCenter/ViewFile/Item/2781
13. https://archive.cdc.gov/www_cdc_gov/salmonella/coconut-01-18/index.html
14. 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
15. https://outbreakdatabase.com/outbreaks/2017-multistate-outbreak-of-salmonella-newport-and-salmonella-infantis-linked-to-maradol-papayas
16. https://www.fsis.usda.gov/sites/default/files/media_file/documents/Newport_AAR_2022072722_cln.pdf
17. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6406a3.htm#:~:text=In%20August%202014%2C%20PulseNet%2C%20the,pattern%20
18. https://archive.cdc.gov/www_cdc_gov/salmonella/typhimurium-cantaloupe-08-12/index.html
19. https://outbreakdatabase.com/outbreaks/2006-outbreak-of-salmonella-newport-at-a-restaurant-linked-to-watermelon-new-york
20. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5635a3.htm
21. https://www.cidrap.umn.edu/foodborne-disease/uk-salmonella-outbreak-linked-lettuce
22. https://pmc.ncbi.nlm.nih.gov/articles/PMC2870807/#:~:text=Salmonella%20Newport%20causes%20more%20than,510%20patients%20in%2026%20states
23. https://pubmed.ncbi.nlm.nih.gov/12118534/
24. https://pubmed.ncbi.nlm.nih.gov/14689335/
25. https://outbreakdatabase.com/outbreaks/1995-outbreak-of-salmonella-newport-associated-with-alfalfa-sprouts
26. https://webgate.ec.europa.eu/rasff-window/screen/notification/745388
27. https://webgate.ec.europa.eu/rasff-window/screen/notification/737443
28. https://webgate.ec.europa.eu/rasff-window/screen/notification/522132
29. https://webgate.ec.europa.eu/rasff-window/screen/notification/425465
30. https://webgate.ec.europa.eu/rasff-window/screen/notification/423186
31. https://webgate.ec.europa.eu/rasff-window/screen/notification/625006
32. https://webgate.ec.europa.eu/rasff-window/screen/notification/608601
33. https://webgate.ec.europa.eu/rasff-window/screen/notification/555203
34. https://archive.cdc.gov/www_cdc_gov/salmonella/newport-07-20/updates.html
35. https://www.fsis.usda.gov/recalls-alerts/jbs-tolleson-inc--recalls-raw-beef-products-due-possible-salmonella-newport
36. https://outbreakdatabase.com/outbreaks/2012-multistate-outbreak-of-salmonella-newport-linked-to-cantaloupe