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    Título
    Placental thrombosis in acute phase abortions during experimental Toxoplasma gondii infection in sheep
    Autor
    Castaño Labajo, Pablo
    Fuertes Franco, Miguel
    Ferre, I
    Fernández Fernández, Miguel
    Ferreras, MC
    Moreno-Gonzalo, J
    González-Lanza, C
    Katzer, F
    Regidor-Cerrillo, J
    Ortega-Mora, LM
    Pérez, V
    Benavides Silván, Julio
    Facultad/Centro
    Facultad de Veterinaria
    Área de conocimiento
    Sanidad Animal
    Datos de la obra
    Veterinary Research, 2014, 29, 45
    Fecha
    2014
    Descripción física
    43 p.
    Abstract
    After oral administration of ewes during mid gestation with 2000 freshly prepared sporulated oocysts of T. gondii isolate M4, abortions occurred between days 7 and 11 in 91.6% of pregnant and infected ewes. Afterwards, a further infection was carried out at late gestation in another group of sheep with 500 sporulated oocysts. Abortions happened again between days 9 and 11 post infection (pi) in 58.3% of the infected ewes. Classically, abortions in natural and experimental ovine toxoplasmosis usually occur one month after infection. Few experimental studies have reported the so-called acute phase abortions as early as 7 to 14 days after oral inoculation of oocysts, and pyrexia was proposed to be responsible for abortion, although the underline mechanism was not elucidated. In the present study, all placentas analysed from ewes suffering acute phase abortions showed infarcts and thrombosis in the caruncullar villi of the placentomes and ischemic lesions (periventricular leukomalacia) in the brain of some foetuses. The parasite was identified by PCR in samples from some placentomes of only one sheep, and no antigen was detected by immunohistochemical labelling. These findings suggest that the vascular lesions found in the placenta, and the consequent hypoxic damage to the foetus, could be associated to the occurrence of acute phase abortions. Although the pathogenesis of these lesions remains to be determined, the infectious dose or virulence of the isolate may play a role in their development
    Materia
    Veterinaria
    Idioma
    eng
    Tipo documental
    info:eu-repo/semantics/article
    Peer review
    SI
    URI
    http://hdl.handle.net/10612/5693
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