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No papillomavirus-DNA detected in feline sarcoids
Feline sarcoids or fibropapillomas were thought to be caused by papilloma virus. A group from Germany and Canada doubted this opinion and tried to identify the virus by PCR in 12 tumours. The result: There are parallels to equine sarcoids, and no virus could be found in the hyperplastic epithelium of these tumours.

We examined 12 formalin-fixed paraffin-embedded feline skin tumours which had the histopathological features of fibropapillomas for the presence of papillomavirus (PV) DNA using touchdown polymerase chain recation (PCR), DNA sequencing and nonradioactive in situ hybridization.

Nine of the tumours contained a 102-bp PCR product demonstrated using consensus PV primers that amplify a portion of the L1 gene. The nucleotide sequences are closely related, but not identical to that of ovine PV type 2, rabbit oral PV and reindeer PV. The deduced amino acid sequences had strong homologies with the major capsid protein L1 of deer PV, bovine papillomavirus (BPV) 1 and BPV 2, and European elk PV.

Although PV antigens were not detected in any of the tumours by immunohistochemistry, PV DNA was demonstrated in individual mesenchymal cells or cell nests of 4/12 tumours by in situ hybridization. A nonproductive infection of mesenchymal fibroblast-like tumour cells with a papillomavirus would explain the lack of PV antigen expression and the absence of PV DNA in the hyperplastic epithelium.

Because these tumours and their pathogenesis are similar to equine sarcoids, we suggest that they should be reclassified as `feline sarcoids` instead of fibropapillomas.


Source: Teifke, Jens P., Kidney, Beverly A., Löhr, Christiane V. & Yager, Julie A. (2003): Detection of papillomavirus-DNA in mesenchymal tumour cells and not in the hyperplastic epithelium of feline sarcoids. In: Veterinary Dermatology 14 (1), 47-56



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SMALL ANIMAL PRACTICE

Reference intervals for blood parameters in Shetland Sheepdogsmembers
Several breeds have physiological peculiarities that induce variations in reference intervals (RIs) compared with the general canine population. Shetland sheepdogs (SSs) are reported to be more predisposed to different diseases (eg, hyperlipidemia, gallbladder mucocele, and hypothyroidism). Consequently, a breed‐specific approach is more often required. Thus, the aim of this study was to determine whether the RIs of the general canine population could be applied to that of SSs, and to generate breed‐specific RIs, where appropriate.

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