Kinetics of the proviral load in calves that developed HPL and LPL. Calves were experimentally inoculated with blood from an adult cow with PL at day 0. The proviral load was determined in peripheral blood by qPCR at various days post-inoculation (dpi). The data were log transformed before analysis. Mean values ± standard errors are shown. N = 11 calves with HPL and n = 9 calves with LPL.