The purpose of this study was searching for sequences similar to bovine leukaemia virus genome in the genome of BLV-free cattle. The study was performed using PCR method and hybridisation. Products of amplification with starters specific for BLV genome was discovered. The presence of these sequences was confirmed by hybridisation with molecular probe complementary to BLV genome. It cannot be ruled out that these are endogenous sequences similar to bovine leukaemia virus in the genome of BLV-free cattle.
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