Isolation of digital dermatitis treponemes from cattle hock skin lesions

Veterinary Dermatology
Simon R CleggN J Evans

Abstract

Bovine hock lesions present a serious welfare and production issue on dairy farms worldwide. Current theories suggest that trauma is an important factor in the formation of hock lesions, although infection may also play a role in increasing their severity and duration. Digital dermatitis (DD) lesions in dairy cows are strongly associated with specific treponeme bacteria which are opportunistic invaders of other skin regions. Hock lesions were tested to ascertain if they too contained treponemes. Swab and tissue samples were taken from hock lesions from two farms in South West England. Hock lesions were classified into two categories: open lesions, which were often bleeding and ulcerated, or were encrusted; and closed lesions, which were classified as hair loss with no skin breakage. PCR assays and bacterial isolation were used to detect treponemes in hock lesions. All three phylogroups of digital dermatitis treponemes were detectable and isolated from open hock lesions only, with closed lesions showing no evidence of treponeme infection, either by PCR or bacterial culture. When analysed by 16S rRNA gene sequencing, the cultured treponeme DNA showed complete homology or was very similar to that found in foot lesions. Additionall...Continue Reading

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Citations

Apr 5, 2016·Journal of Comparative Pathology·S R CleggN J Evans
Nov 11, 2017·Transboundary and Emerging Diseases·K OrselH W Barkema
Nov 7, 2017·Journal of Dairy Science·L EkmanK Persson Waller
Jul 10, 2019·Australian Veterinary Journal·J HesselingJ E Coombe
Sep 15, 2019·Tropical Animal Health and Production·Nader Maher SobhyAshraf Awad

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