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Average titer over time for each of 4 viruses. Trend fit using model [1] and removing any nonsignificant factors. BVDV1 = bovine viral diarrhea virus type 1; BVDV2 = bovine viral diarrhea virus type 2; BRSV = bovine respiratory syncytial virus; BHV1 = bovine herpesvirus 1.
