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Background  This study describes the biodiversity and properties of  Bovine leukemia virus  in Western Siberia. This paper explores the effect of different genotypes of the  env  gene of the cattle leukemia virus on hematological parameters of infected animals. The researchers focused on exploring the polymorphism of the  env  gene and, in doing so, discovered the new genotypes  I   a   and  I   b  , which differ from genotype  I . Several hypotheses on the origin of the different genotypes in Siberia are discussed.    Results  We obtained varying length of the restriction fragments for genotypes  I  .  Additionally using restrictase  Hae III  were received fragments was named genotype  I   a  , and genotype  I   b  . There are 2.57 ± 0.55% (20 out of 779) samples of genotype  I   b   which does not differ significantly from 1% (χ 2  = 2.46). Other genotypes were observed in the cattle of Siberia as wild type genotypes (their frequency varied from 17.84 to 32.73%). The maximum viral load was observed in animals with the II and IV viral genotypes (1000–1400 viral particles per 1000 healthy cells), and the minimum viral load was observed animals with genotype  I   b   (from 700 to 900 viral particles per 1000 healthy cells).    Conclusions  The probability of the direct introduction of genotype  II  from South America to Siberia is extremely small and it is more likely that the strain originated independently in an autonomous population with its distribution also occurring independently. A new variety of genotype  I  ( I   b  ) was found, which can be both a neoplasm and a relict strain.

Genotypes diversity of env gene of Bovine leukemia virus in Western Siberia