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.
Animal reservoir: Salmonella Newport was found in cattle, chicken, pig, horse and goat.
Geographical distribution: Serovar Newport has been mainly found in North America, and Europe.
Outbreaks: Outbreaks have been associated with S. Newport.
| Year | Location | Associated Source | Number of Cases |
|---|---|---|---|
| 1995-1996 | US | Alfalfa | >133 |
| 1999 | US | Mangoes | 79 |
| 2002 | US: Multi-state | Tomatoes | 510 |
| 2002 | US: Multi-state | Ground beef | 47 |
| 2004 | US | Lettuce | 97 |
| 2005-2006 | US: Multi-state | Raw tomatoes | 187 |
| 2006 | US | Watermelon | 20 |
| 2016-2017 | US: Multi-state | Ground beef | 106 |
| 2017 | US: Multi-state | Imported maradol papayas | 4 |
| 2018 | US: KS | Tomatoes | 14 |
| 2018 | France & Scotland | Raw goats' milk cheese | France: 147 Scotland: 6 |
| 2018-2019 | US: Multi-state | Ground beef produced by JBS Tolleson, Inc | 403 |
| 2019 | US: Multi-state | Frozen, ground tuna from JK Fish of Vietnam | 13 |
| 2019 | US: Multi-state | Tuna | 15 |
| 2019 | US: Multi-state | Pig ear treats for dogs | 93 (Three serovars were involved: Infantis, London, and Newport) |
| 2019 | Sweden | Frozen crayfish from China | 33 |
| 2020 | US & Canada | Red onions | US: 1127 Canada: 515 |
| 2020 | France | Raw or rare horse meat | 20 |
| 2021 | US | Infant formula | 4 (3 of them were associated with Cronobacter sakazakii infections) |
Relevant links and references:
- https://www.fda.gov/food/outbreaks-foodborne-illness/factors-potentially-contributing-contamination-red-onions-implicated-summer-2020-outbreak-salmonella
- https://www.cdc.gov/salmonella/general/technical/newport.html
- https://www.cdc.gov/salmonella/newport-07-20/index.html
- https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-salmonella-newport-frozen-ground-tuna-april-2019
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC309039/
- https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5125a1.htm
- https://jamanetwork.com/journals/jama/article-abstract/193406
- https://www.addl.purdue.edu/newsletters/2004/summer/salmnewp.htm
- https://pubmed.ncbi.nlm.nih.gov/36382397/
- https://www.cdc.gov/mmwr/volumes/67/wr/mm6715a2.htm#F1_down
- https://www.cdc.gov/salmonella/newport-10-18/index.html
- https://www.aphis.usda.gov/aphis/ourfocus/animalhealth/animal-and-animal-product-import-information/organisms-vectors/livestock-poultry-pathogens
- https://www.fsis.usda.gov/sites/default/files/media_file/2022-06/Newport_AAR_20220519_cln.pdf
- https://www.canada.ca/en/public-health/services/public-health-notices/2020/outbreak-salmonella-infections-under-investigation.html
- https://www.foodsafetynews.com/tag/salmonella-newport/
- https://www.sciencedirect.com/science/article/abs/pii/S016816051830638X
- https://www.sciencedirect.com/science/article/pii/S0362028X22086392#bb0210
- https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5635a3.htm
- https://www.liebertpub.com/doi/pdf/10.1089/fpd.2008.0232
- https://www.cdc.gov/salmonella/newport-09-17/index.html
- 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