[Hemagglutinating antibodies in the serum and intestinal secretions of rats infested by Nippostrongylus brasiliensis].

Nippostrongylus brasiliensis infected rats responded with the formation of hemagglutinating antibodies in both serum and intestinal secretions. After the first infection seric antibody titers were quite weak but increased sharply after challenge. Intestinal secretion hemagglutinines remained at constant level after both infections. This result represents a new approach in our understanding of the immune mechanism towards this parasite in rats.