In the analysis of haplotypes associated with infections, significant differences were identified in chromosomes 5, 6, 8, 10, 15, 17, 18, 27, and X. Haplotypes from IL10RA and TLR3 were present in a high rate of seronegative animals and may indicate a possible genotype of resistance to bovine leukosis virus. This evidence concerns the gene TLR3 and infection.