T. foetus with surface AP33::HA displays enhanced level of adherence to immortalized MS-74 VECs. Transfected trichomonads with AP33::HA (bar labeled Tf-AP33) had higher levels of adherence compared to wt T. foetus (bar Tf), as before for heterologously-expressed AP65 . The percent level of adherence was adjusted to that seen for T. vaginalis (Tv). Trichomonads expressing AP33::HA were pretreated with anti-AP33 antiserum (bar Tf-AP33 + antibody). The results are the average from four different experiments, and each experiment was carried out using quadruplicate samples.