the effect of virus infection on the pig 's immune system was tested by measuring peripheral leucocyte numbers and the ability of mononuclear leucocytes ( mnl ) to respond by lymphocyte proliferation ( lp ) to the mitogens phytohemagglutinin-p ( pha-p ) , concanavalin-a ( con-a ) , and pokeweed mitogen ( pwm ) .
C0020962
immune system
C0023516
leucocytes