Background: Salmonella enterica subsp. enterica serovar Oslo (antigenic formula 6,7,14:a:e,n,x) is a serovar of the serogroup O:7 (C1). Strains in this group can be lysogenized by phage 14 (O:6,7 ––> O:6,7,14, former group C4). The Oslo serotype is rare with about 25 cases reported each year in the US.

Animal reservoir: Serovar Oslo was found in squid. 

Geographical distribution: Serovar Oslo has been found in India, and US. 

Outbreaks:

Year

Location

Associated source

Number of cases

2016

US, Multistate

Cucumbers

14

2023

US, Louisiana

Crawfish

28


Relevant links and references:

  1. https://www.cdc.gov/mmwr/volumes/65/wr/mm655051a3.htm
  2. http://www.serotest-thailand.com/upload/news/download/9-8310-0.pdf
  3. https://event.fourwaves.com/inform/abstracts/d3671885-2a45-4774-8db4-7e8e800cfc41
  4. https://www.sciencedirect.com/science/article/pii/0002934376904290?via%3Dihub
  5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6930137/
  6. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2643569/
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