Fluorescence microscopy demonstrating RBC and Listeria cells agglutination in the presence of mBsAb (A) and pBsAb (B) generated for simultaneous interaction with both RBC as well Listeria cell surface antigen.

Phase contrast (Aa and Ba) and fluorescence images (Ab and Bb) at x20. Same as Ba and Bb at x40 (Bc and Bd). At least three independent experiments were performed for each sample and data are representative of three independent experiments with similar observations.