Acquisition of Immunological Competence to Gastro-Intestinal Trichostrongyles by Young Ruminants: Epidemiological Significance

摘要: The acquisition of immune competence varies with the species animal and kind infection or antigen presented. neonatal lamb fails to develop a significant protective response helminth infections until it is several weeks months age. By this time, in field, animals may have been subjected severe, even fatal, challenge from herbage. Animals unable mount satisfactory control be major source for other animals. There appears sequential development immunological various antigens differences responsiveness helminths on part lambs are discussed reference genetic variability (responders non-responders), maternally transferred antibody, colostral transfer tolerogenic substances, suppressive factors newborn serum, suppressor cells induced cell formation.