Effect of vaccination of cattle with the low virulence Nc-Spain 1H isolate of Neospora caninum against a heterologous challenge in early and mid-gestation
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- 作者：Silvia Rojo-Montejo (1)
Esther Collantes-Fernández (1)
Francisco Pérez-Zaballos (1)
Sonia Rodríguez-Marcos (1)
Javier Blanco-Murcia (1)
Antonio Rodríguez-Bertos (1)
Antoni Prenafeta (2)
Luis Miguel Ortega-Mora (1) - 刊名：Veterinary Research
- 出版年：2013
- 出版时间：December 2013
- 年：2013
- 卷：44
- 期：1
- 全文大小：550 KB
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Esther Collantes-Fernández (1)
Francisco Pérez-Zaballos (1)
Sonia Rodríguez-Marcos (1)
Javier Blanco-Murcia (1)
Antonio Rodríguez-Bertos (1)
Antoni Prenafeta (2)
Luis Miguel Ortega-Mora (1)
1. SALUVET, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Avda. Puerta de Hierro s/n, 28040, Madrid, Spain
2. HIPRA, Avda. La Selva, 17170, Amer, Spain - ISSN：1297-9716
文摘
Live vaccines have emerged as one of the most potentially cost-effective measures for the control of bovine neosporosis. Previous studies have shown that Nc-Spain 1H is a naturally attenuated isolate of Neospora caninum and that immunisation with live Nc-Spain 1H tachyzoites generated a protective immune response in mice. The aim of this study was to evaluate the safety and efficacy of immunisation in cattle. N. caninum-seronegative heifers were immunised subcutaneously twice with 107 live Nc-Spain 1H tachyzoites prior to artificial insemination. No adverse reactions or negative effects on reproductive parameters were recorded following immunisation. In immunised and non-challenged heifers, no foetal deaths were observed, and none of the calves was congenitally infected. The efficacy against N. caninum-associated foetal death and vertical transmission was determined after challenge with high doses of the Nc-1 isolate at 70 and 135?days of gestation, respectively. After the challenge in early gestation, the immunisation induced a protection of 50% against foetal death. In addition, the microsatellite analysis performed in PCR-positive tissue samples from foetuses that died after challenge infection showed that the profiles corresponded to the challenge isolate Nc-1. A degree of protection against vertical transmission was observed after challenge at mid-gestation; calves from immunised heifers showed significantly lower pre-colostral Neospora-specific antibody titres than calves from the non-immunised/challenge group (P-lt;-.05). Strong antibody and interferon gamma responses were induced in the immunised heifers. This study indicates that the immunisation before pregnancy with the Nc-Spain 1H vaccine isolate appeared to be safe and reduced the occurrence of N. caninum-associated abortion and vertical transmission in experimentally infected cattle. In light of these encouraging results, the next step for testing this live attenuated candidate should be the assessment of its efficacy and safety in naturally infected cattle.