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Year : 1999
Tome : 150
Volume : 6
Pages : 511-516
Title : Host-parasite relationship : the example of sheep nasal bot, Oestrus ovis (Linné 1761) in sheep and goats.
Authors : Ph. DORCHIES, G. TABOURET, Ch. DURANTON et Ph. JACQUIET
Summary : Host-parasite relationships are complex and for both components a great number of resistance mechanisms are involved. Oestrus ovis, the sheep nasal bot, is a Dipterous insect, living as larvae in nasal cavities and frontal sinuses of sheep and goats. The adult forms are short-lived flies that do not feed and survive from energetic reserves accumulated during the parasitic larval stage. The females are viviparous and lay first stage larvae on the nostrils of sheep and goats. It is worth exploring the host-parasite relationship with this model. After parasitic infection, the hosts' defense may be humoral and cellular. But inflammatory and immunological phenomenons are not always beneficial to hosts. In many cases, pathogenetic phenomena develop : clinical signs and lesions of oestrosis are more due to the hosts hypersensitive reaction than to parasitic agression. The clinical expressions of the disease vary according to the level of tolerance, acceptance or rejection of the parasite by the host or of the host by parasite The parasite is very adaptable and will contaminate "easy" preys or "easy" hosts as young animals. In some cases, parasites will survive in refugia : outside, in the soil, during an extended pupation period or inside the hosts, during an hypobiotic phase of first age larvae. Finally, it appears that Oestrus ovis is very well adapted to its host and thus able to assure its survival in flocks
Keywords : Oestrus ovis, parasite, adaptation, sheep,goat
Correspondence : Ph. DORCHIES
Adress : Laboratoire de Parasitologie, École Nationale Vétérinaire de Toulouse,23, chemin des capelles, F-31076 Toulouse cedex 3

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