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BRSV-specific IgG serum antibody responses in vaccinated calves. Calves (identified as calf ‘a’ through ‘t’) were immunized as described in Fig. 1 (blue arrows) and challenged with BRSV on PID 0 (red arrow). Sera were obtained on days indicated, diluted 1:25 and analysed by ELISA. Corrected OD (COD) values are presented as percent of positive reference sera. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of the article.)
