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Summary of MDA titres from calves in the field. Results of the field serology survey of PI3V (left) and BRSV (right) MDA. The starred columns indicate the titres of the MDA+ vaccinated calves in the challenge studies, at the time of vaccination. BRSV, bovine respiratory syncytial virus; MDA, maternally derived antibodies; PI3V, parainfluenza type 3 virus.
