Samples were separated on 10% bis-tris gels (Novex) and transferred to Hybond LFP membranes (GE Healthcare). Membranes were blocked with 5% skimmed milk (Sigma-Aldrich) prior to the addition of CTAb antibody8 (link). Bound antibodies were detected using a 1:80,000 dilution of HRP-conjugated goat anti-rabbit IgG (Sigma-Aldrich) and the ECL prime detection system (GE Healthcare). Where appropriate, TCA-precipitated bacterial supernatants, or recombinant proteins, rSIC24 (link) and rSpeB (Toxin Technology), were used as positive controls.
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