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Genetic characteristics: 

Animal reservoir: Wild geckos are likely to be the reservoir for serovar Weltevreden. Serovar Weltevreden was also frequently reported from seafood. 

Geographical distribution: Serovar Weltevreden has been found worldwide. . Over the past 20 years, Salmonella Weltevreden has become a predominant serovar, particularly in Southeast Asia, including countries such as Oman, Singapore, China, Thailand, Vietnam, and India.

Human outbreaks: 

¹ Multiple serovars including Salmonella I 4,[5],12:b:-, Heidelberg, Javiana, Okatie, Weltevreden, and Thompson were involved in this outbreak.  The case number here does not reflect the number of infections linked to Salmonella Weltevreden only.

² Sixty-five individuals across 11 states were reported infected with outbreak strains, including 64 cases of Salmonella Paratyphi B variant L(+) tartrate(+) and 1 case of Salmonella Weltevreden. 

Border rejections: There have been no recent border rejections linked to this serovar. 

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⁴ This recall was caused by a multi-country outbreak described above.

Relevant links:

1. https://onlinelibrary.wiley.com/doi/abs/10.1111/zph.12873
2. https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2020.01985/full
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC9927414/
4. https://www.liebertpub.com/doi/10.1089/fpd.2023.0064#:~:text=In%20the%20last%20two%20decades,et%20al.%2C%202021).

1. https://archive.cdc.gov/www_cdc_gov/salmonella/weltevreden-06-21/index.html
2. https://archive.cdc.gov/www_cdc_gov/salmonella/paratyphi-b-05-15/index.html
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC10961741/
4. https://www.foodsafetynews.com/2019/10/almost-50-ill-in-australian-salmonella-outbreak/
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC8242109/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC4418162/
7. https://www.eurosurveillance.org/content/10.2807/ese.13.32.18949-en
8. https://www.eurosurveillance.org/content/10.2807/esw.12.48.03321-en
9. https://webgate.ec.europa.eu/rasff-window/screen/notification/688257
10. https://www.foodsafetynews.com/2023/05/black-fungus-recalled-in-12-states-after-testing-finds-multiple-strains-of-salmonella/
11. https://webgate.ec.europa.eu/rasff-window/screen/notification/597121
12. https://www.fda.gov/food/outbreaks-foodborne-illness/outbreak-investigation-salmonella-weltevreden-frozen-pre-cooked-shrimp-april-2021#:~:text=CDC%20declares%20outbreak%20over.&text=The%20FDA%2C%20along%20with%20CDC,that%20the%20outbreak%20is%20over.
13. https://www.eurosurveillance.org/content/10.2807/esw.12.48.03321-enhttp://journals.plos.org/plosone/article?id=10.1371/journal.pone.0134252