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Bovine respiratory syncytial virus (BRSV) antibody level (per cent positivity (PP)) of diluted bulk tank milk (BTM) samples from 11 selected herds. PP values of four ascending dilutions of BTM in 11 herds. Dilution numbers 1 through 4 represent an undiluted sample and samples diluted by a ratio of 1:2, 1:4 and 1:8
