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  • Title: Neospora caninum tachyzoites inoculated by the conjunctival route are not vertically transmitted in pregnant cattle: a descriptive study.
    Author: Moore DP, Alvarez-García G, Chiapparrone ML, Regidor-Cerrillo J, Lischinsky LH, de Yaniz MG, Odeón AC, Ortega-Mora LM, Campero CM.
    Journal: Vet Parasitol; 2014 Jan 17; 199(1-2):1-7. PubMed ID: 24184173.
    Abstract:
    The aim of this study was to evaluate whether Neospora caninum tachyzoites (Nc-1) inoculated by the conjunctival route in pregnant cows were able to generate infection in their fetuses. Group 1 contained 2 naturally infected cows; group 2 contained two cows inoculated intravenously with 2.5 × 10(8) tachyzoites, group 3 contained two cows inoculated with 2.5 × 10(8) tachyzoites by the conjunctival route, and group 4 contained two uninfected control cows. The four inoculated cows from groups 2 and 3 were challenged at 23 weeks of gestation. An indirect fluorescent antibody test (IFAT), recombinant NcGRA7-based ELISA, ELISA for IgG subisotypes and Western blot analysis were assessed to characterize the humoral immune response in dams. Sera from their fetuses were tested also using Western blot analysis. Routine microscopic evaluation of H&E stained fetal tissues was made and any fetal tissues and placentas with lesions compatible with Neospora-infection were processed by immunohistochemistry (IHC). DNA extraction from fresh and formalin-fixed, paraffin-embedded fetal tissues were tested by nested PCR. All dams from groups 1, 2 and 3 were seropositive by IFAT, rNcGRA7-based-ELISA and Western blot. IgG1/IgG2 ratios were ≤ 1 at weeks 27 and 29 of gestation. Only fetuses from groups 1 and 2 developed N. caninum specific antibodies by Western blot. Histopathological lesions compatible with those caused by N. caninum were observed in fetuses from groups 1 and 2. N. caninum cysts and tachyzoites were observed by IHC on fetal tissues from groups 1 and 2. Only fetal samples from group 2 were positive by PCR. Further work is needed not only to characterize the cellular immune response but also to clarify the consequences on the dam after conjunctival inoculation of N. caninum tachyzoites. This study shows that N. caninum tachyzoites inoculated by the conjunctival route were not vertically transmitted in pregnant cows.
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