Fig. 4From: Combined use of ELISA and Western blot with recombinant N protein is a powerful tool for the immunodiagnosis of avian infectious bronchitisWestern blot analyses of the avian serum samples that scored negative for the IDEXX IBV Ab Test and positive in the ELISA-rN. Lane 1: Spectra Multicolor Broad Range Protein Ladder (ThermoFisher Scientific); Lanes 2–15: Serum samples with discrepant ELISA resultsBack to article page