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Background: Salmonella enterica subsp. enterica serovar Napoli (antigenic formula 1,9,12:l,z13:e,n,x) is a serovar of the O:9 (D1) serogroup. This is a rare serovar, in the US only 19 cases were reported from 1999-2009. In other regions of the world S. Napoli is also rare, except for France, Italy, and Switzerland were it appears to have increased considerably. Recently, it was reported in rucola and in wild birds from Italy.

Animal reservoir: poultry and wild birds have been reported as animal sources of this serovar.

Geographical distribution: Serovar Napoli appears to be distributed in Europe, specifically in France, Italy, and Switzerland.

Phylogenetic Information: Serovar Napoli has the typhoid-associated genes hlyE and taiA (SPI-18), cdtB, pltA, and pltB (CdtB-Islet), as well as the GICT18/1 islet.

Symtpoms: Although it is a nontyphodial Salmonella strain some if its symptoms, including a prolonged incubation period (7–14 days), high fever, bacteremia, and elevated rates of hospitalizations, are similar to those caused by typhoidal Salmonella

Human Outbreaks:

Year

Location

Associated source

Number of cases

1982

England

Chocolate bars

245

2014Milan, ItalyHam47 


Border Rejections:

Year

Location

Associated Source

Number of Cases

2022

Finland

Fresh thyme from Italy, packaged in the Netherlands

NA

Relevant links and references:

  1. http://www.ncbi.nlm.nih.gov/pubmed/19534593
  2. http://www.ncbi.nlm.nih.gov/pubmed/6131266
  3. http://www.iss.it/binary/publ/cont/ANN_14_01_14.pdf
  4. http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20519
  5. http://online.liebertpub.com/doi/full/10.1089/fpd.2015.2091
  6. http://online.liebertpub.com/doi/full/10.1089/fpd.2016.2206
  7. https://webgate.ec.europa.eu/rasff-window/screen/notification/556383
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