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NCBI PD link for serovar Thompson: https://www.ncbi.nlm.nih.gov/pathogens/isolates/#(taxgroup_name:%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=Thompson%22)

Genetic characteristics: Serovar Thompson has been found to be polyphyletic with four lineages identified and one stand-alone singleton that does not cluster with any other Salmonella Thompson isolates. Zhang et al. revealed that all serovar Thompson strain in their study carried aac(6′)-Iaa and the polymyxin resistance gene mcr-9, though susceptibility to polymyxin B confirmed that mcr-9 did not produce a resistant phenotype. Antimicrobial sensitivity testing against 18 antibiotics showed that serovar Thompson isolates were resistant to streptomycin (100%), ampicillin (35.7%), and doxycycline (14.3%). Additionally, all serovar Thompson isolates harbored well-characterized virulence genes, including those from Salmonella pathogenicity islands (SPI1-5), fimbriae (fimA), flagellar assembly (bcfC, flhD, fliA, fliC, fljB, flgK, lpfC), and other virulence factors (iroN, pagC, cigR). Pathogenicity was further confirmed through yolk sac inoculation in 1-day-old chicks, suggesting that clinical serovar Thompson strains are highly pathogenic to newborn chicks.

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