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Initial antibody titer (wk 0) by calf age in days averaged across year–season classification for bovine viral diarrhea virus type 1 (BVDV1), bovine viral diarrhea virus type 2 (BVDV2), bovine respiratory syncytial virus (BRSV), and bovine herpesvirus 1 (BHV1) and extrapolated between 50 and 200 d of age.
