Studies on the Role of Histamine and 5-Hydroxytryptamine in Immunity against the Nematode Trichostrongylus colubriformis

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Abstract
A temporal relationship was established between the onset of expulsion of the parasitic nematode Trichostrongylus colubriformis from the intestine of both vaccinated and adoptively immunized guinea pigs with a sudden increase in small intestinal mucosal histamine to two or three times pre-infection levels. However, in guinea pigs whose capacity to expel T. colubrijormis was inhibited by treatment with anti-lymphocyte serum, mucosal histamine remained at pre-infection levels. The results support previous findings which suggest an important role for histamine in the effector mechanism of the immune response of guinea pigs against T. colubrijormis.