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Circulating antibodies against larvae of oestrus ovis diptera oestridae in naturally infected goats



Circulating antibodies against larvae of oestrus ovis diptera oestridae in naturally infected goats



Folia Entomologica Mexicana (52): 75-86



The diagnosis of O. ovis larvae infestation in sheep and goats was based on clinical findings such as profuse anasal discharges, the presence of larvae in these discharges, and hard to detect light infestation. There have been no previously published studies on the immunological diagnosis of this parasitis disease. Two crude somatic antigens were prepared from O. ovis larvae: 1 from the 2nd-stage larvae, and 1 from the 3rd-stage larvae. By using these antigens, the following tests were carried out on 100 goats, and their sera, slaughtered at the Ferreria abattoir in Mexico City [Mexico]: introdermal test (IDT), double immunodiffusion (DID), and indirect hemagglutination (IHA). The heads of the slaughtered antimals were examined in order to determine O. ovis larvae presence. Goats (26) from Merida, Yucatan State, Mexico (to date, O. ovis infestation in sheep and goats was not found in this area) were used as controls, except that the animals were not slaughtered. Similar values were observed in both groups of animals with IDT. The DID detected 3 (3%) out of 100 sera, collected from the animals at the abattoir, with anti-O. ovis antibodies; the sera of the control animals were negative. The IHA detected 77 (77%) out of 100 sera, collected from the animals at the abattoir, with anti-O. ovis antibodies; the sera of the control animals were negative. In 53 (53%) out of 100 goats slaughtered at the abattoir, O. ovis larvae were observed. O. ovis larvae infested goats mount a detectable immune response against the parasite; the IHA may be a suitable test for detecting this response.

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Accession: 004959861

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