‘Self-Cure’ in Nematode Infestations of Sheep

  title={‘Self-Cure’ in Nematode Infestations of Sheep},
  author={Derek Stewart},
EARLIER, studies with sheep infested with Haemonchus contortus or with Trichostrongylus colubriformis1–3 showed that the ‘self-cure’ phenomenon was caused by the intake of infective larvæ by sheep rendered hypersensitive as a result of previous infestations. The hypersensitive reaction was evidenced by a transient rise in blood-histamine within four days, by the development of skin-sensitivity to an antigen prepared from larvæ and by the development of œdema in the portion of the alimentary… CONTINUE READING

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