The integrity of the purified recombinant proteins was confirmed by Western blot analysis. Western blotting was performed according to the standard protocol [14 (link)] using sera from rabbit immunized against Vibrio cholerae and negative sera (as the negative controls) as the primary antibody at 1 : 100 dilution and HRP-conjugated (horseradish peroxidase) goat anti-rabbit IgG (Abcam, United Kingdom) at 1 : 2500 dilution in 1x TBST buffer (10x: 15 mMNaCl, 10 mMTris-HCl (pH = 7.4), 0.1% Tween 20) as secondary antibody. The reactions were developed by diaminobenzidine (DAB) solution (Roche, Germany).
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