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Background: Salmonella enterica subsp. enterica serovar I 9:l,z₂₈:- (antigenic formula: 1,9,12:l,z₂₈:-) is a serovar of the O:9 (D₁) serogroup. This serovar is extremely understudied, with limited information available. According to the 10th Annual PulseNet Update Meeting, the CDC suggested that this serovar is likely a monophasic variant of serovar Javiana (antigenic formula: 1,9,12:l,z₂₈:1,5). This is because serovar I 9:l,z28:- shares the same O and H1 antigens as serovar Javiana but does not express the H1 antigen, making it monophasic.

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Recalls: There have been no recent recalls linked to this serovar.

Relevant links:

1. https://www.aphl.org/conferences/proceedings/Documents/2006/10th-Annual-PulseNet/22_Fields_Salm_Sero.pdf
2. https://www.ncbi.nlm.nih.gov/datasets/genome/GCA_009223065.1/