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Background: Salmonella enterica subsp. diarizonae serovar 61:k:1,5,(7) (antigenic formula 61:k:1,5,(7)) is a serovar of the O:61 serogroup. This serovar was first found in sheep in 1952 from carcasses of newborn lambs. In Great Britain, serovar IIIb 61:k:1,5,(7) is the predominant Salmonella serotype in sheep, representing more than 60% of reported infections in this species. Chronic proliferative rhinitis (CPR) in sheep has been reported as a new disease associated with serovar IIIb 61:k:1,5,(7) in the USA, Spain, and Switzerland. CPR is a chronic disease mainly affecting adult sheep, posing a risk of spreading serovar IIIb 61:k:1,5,(7) between flocks and exhibiting zoonotic potential. Infection with serovar IIIb 61:k:1,5,(7) can also cause abortions in sheep. 

NCBI PD link for serovar IIIb 61:k:1,5,(7): https://www.ncbi.nlm.nih.gov/pathogens/isolates/#(taxgroup_name:%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=IIIb%2061:k:1,5,(7)%22)

Genetic characteristics: Among IIIb 61:k:1,5,(7) isolates in Swiss sheep flocks Weber et al. analyzed, no resistant isolates were detected, except for one isolate showing resistance against ampicillin. A German study pointed out that all IIIb 61:k:1,5,(7) strains they tested were susceptible to 13 out of 14 antimicrobial substances, with resistance observed only to sulfamethoxazole. The high number of macrorestriction groups among IIIb 61:k:1,5,(7) strains suggests low clonality within this serovar. Uelze et al. claimed that serovar IIIb 61:(k):1,5,(7) tends to be opportunistic, with low virulence and high susceptibility to antimicrobials. Phylogeny? https://pmc.ncbi.nlm.nih.gov/articles/PMC8549363/

Animal reservoir: Serovar IIIb 61:k:1,5,(7) is host-adapted to sheep.  

Geographical distribution: Serovar IIIb 61:k:1,5,(7) has been reported in the US, Canada, Brazil, and Europe. 

Human outbreaks: Not clear, at least no recent human outbreaks linked to this serovar have been reported. 

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

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

Relevant links:

  1. https://pubmed.ncbi.nlm.nih.gov/13022486/
  2. https://www.aphis.usda.gov/sites/default/files/%3Ca%20href%3D%22/taxonomy/term/1696%22%20hreflang%3D%22en%22%3ENAHMS%20Studies%3C/a%3E/sheep11_is_salmonella.pdf
  3. https://www.sciencedirect.com/science/article/pii/S0167587716306237?via%3Dihub
  4. https://www.sciencedirect.com/science/article/pii/S092144881830141X?via%3Dihub
  5. https://www.sciencedirect.com/science/article/pii/S0167587722001301?via%3Dihub
  6. https://bmcvetres.biomedcentral.com/articles/10.1186/s12917-018-1741-4
  7. https://www.intechopen.com/chapters/74818
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