The influence of protease-inhibiting preparations on the development o
f humoral immune response diseases involving the development of second
ary immunodeficiency (experimentally induced acute pancreatitis and st
aphylococcal infection) has been studied. Five injections of contrycal
and epsilon-aminocaproic acid (epsilon-ACA), starting from day 1 afte
r the induction' of acute pancreatitis, normalized the immune response
induced by sheep red blood cells 24 hours after operation. In staphyl
ococcal infection protease-inhibiting preparations (contrycal, epsilon
-ACA, Amben) produced a protective effect, increasing the survival rat
e and the mean survival time of the animals infected with staphylococc
i.