The purpose of the study was to analyze a part of the nucleotide sequences of ystB gene Y. enterocolitica strains isolated from wild animals. The material for the study consists of 30 Y. enterocolitica biotype 1A strains obtained from different wild animal species and belonging to different genotypes. Phylogenetic analysis of ystB nucleotide sequences belonging to four regular genotypes G1, G2, G3, G4 and to five groups of variations V1, V2, V3, V4, V5 revealed significant differences of Y. enterocolitica strains isolated from wild animals. The most phylogenetically distant were strains belonging to V5.

Background: Equine sarcoids are the most common neoplasms in horses. Bovine papilloma- virus type 1 (BPV-1) is the main viral type identified in equine sarcoids in Europe.

Objective: The aim of the present study was to genetically evaluate BPV types based on DNA analyses of the CDS of the L1 gene. The presence of BPV DNA was confirmed by Degenerate Oligonucleotide-Primed Polymerase Chain Reaction (DOP PCR) with FAP59/FAP64 consensus primers.

Results: The DNA was detected in 21/40 (52.5%) of clinically diagnosed sarcoids. More than half of 14 isolates (66.7%) shared 100% homology with BPV-1 Deltapapillomavirus 4 isolate 09 asi UK (Acc. No. MF384289) and 99% nucleotide identity with BPV-1 isolate EqSarc1 (Acc. No. JX678969). A comparison with BPV-1 isolate EqSarc1 revealed one silent mutation in C5827T which did not change the aminoacid codon. The remaining 6 isolates (28.6%) shared 100% nucleotide identity with the BPV-1 (Acc. No. X02346) “wild type” isolate, and 1 isolate (4.8%) demonstrated 99% nucleotide identity with BPV-2 (Acc. No. M20219).

Conclusions: Variants of BPV-1 isolate EqSarc1 (Acc. No. JX678969) constitute the most prevalent type of BPV-1 in Polish horses.