In this section we will look at preventing bacterial adherence to host cells. Bacteria resist physical removal by means of pili, cell wall adhesin proteins, and/or biofilm-producing capsules. The bind...In this section we will look at preventing bacterial adherence to host cells. Bacteria resist physical removal by means of pili, cell wall adhesin proteins, and/or biofilm-producing capsules. The binding of the Fab portion of the antibody to the adhesive tip of the pili, the cell wall adhesins, or the capsular molecules prevents the bacteria from adhering to and colonizing host cells.