[Immunite reaction of hamsters infected or immunized with Entamoeba histolytica].

The immune response in hamsters either infected or immunized with Entamoeba histolytica was studied. The response was tested by determination of antibodies by the counterimmunoelectrophoresis technique and by lymphocyte transformation induced by the amebic antigen. The results obtained showed differences among both groups when the ability of amebic antigen to induce 3H-thymidine incorporation of lymphocyte cultures is compared. However, the response of lymphocyte cultures to Concanavalin A was similar in both studied groups. On the other hand, a group of hamsters hyperimmunized with E. histolytica antigen incorporated in complete Frend's adjuvant showed a greater immune response than the group receiving a single dose.