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Background: Salmonella enterica subsp. enterica serovar I 4 serovar I 4,[5],12:b:- (antigenic formula 1,4,[5],12:b:-) is a serovar of the O:4 serogroup. (B) serogroup. This serovar is monophasic which doesn't express phase 2 flagellar antigen. Serovar I 4,[5],12:b:- might be the monophasic variant of serovar Paratyphi B, as they only differ in the H₂ antigen. This serovar has been documented as a fluctuating serovar in broiler flocks and has been identified in poultry slaughterhouses in Spain and Denmark. It is also sporadically isolated from human gastroenteritis cases.

NCBI PD link for serovar I 4,[5],12:b:-: https://www.ncbi.nlm.nih.gov/pathogens/isolates/#(taxgroup_name:%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=I%204:b:-%22)

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¹ The recall was prompted by the multistate outbreak described above. The FDA has compiled a full list of recalled kratom products, but it is currently unavailable.

Relevant links:

1. https://www.pasteur.fr/sites/default/files/veng_0.pdf
2. https://www.sciencedirect.com/science/article/pii/S0378113501003479?via%3Dihub
3. https://www.sciencedirect.com/science/article/pii/S0378113596012904?via%3Dihub
4. https://www.sciencedirect.com/science/article/pii/S1567134810002030?via%3Dihub
5. https://academic.oup.com/jambio/article-abstract/94/5/826/6722108?redirectedFrom=fulltext
6. https://www.researchgate.net/publication/241693851_Population_Structure_of_Salmonella_enterica_Serovar_4512b-_Strains_and_Likely_Sources_of_Human_Infection
7. https://archive.cdc.gov/www_cdc_gov/salmonella/kratom-02-18/index.html
8. https://archive.cdc.gov/#/details?url=https://www.cdc.gov/salmonella/coconut-01-18/index.html