Abstract
We studied the in vitro effects of levamisole on phagocytosis by macrophages and on proliferation of lymphocytes obtained from human peripheral blood. It was observed that levamisole dire~tly stimulated phagocytosis in a lymphocyte-free system. En~ lancement. was ~pumal at a concentration that inhibited antigen- or mitogeninduced stimulation of sensitive lymphocytes. Lower concentrations of levamisole enhanced the proliferative lymphocyte response.