Kinetics of the proviral load in calves experimentally infected with BLV. Calves were experimentally inoculated with blood from an adult cow with PL. The proviral load was quantified by qPCR in samples of DNA extracted from PBLs from calves carrying different BoLA-DRB3 alleles. The data were log transformed before analysis. Mean values ± standard errors. N = 6 calves with BoLA DRB3*1501, n = 7 calves with BoLA DRB3*902 and n = 6 calves with neutral alleles.