Savio E, Nieto A
Laboratorio de Inmunología Regional Norte Sede Salto, Universidad de la República, Salto, Uruguay.
Vet Parasitol. 1995 Dec;60(3-4):241-7. doi: 10.1016/0304-4017(94)00764-8.
Specific anti-Toxoplasma gondii antibodies were analyzed by latex agglutination during the 5 months of pregnancy in the serum of sheep from two flocks in the Uruguayan north-west: one flock (79 sheep) kept under an intensive management system and the other (494 sheep) kept under an extensive management system. Titers obtained using the latex test correlated with those obtained by indirect immunofluorescence. Pregnancy was confirmed by laparoscopy in all sheep from the smaller flock and by determination of serum progesterone levels in the seroconverted sheep from the larger flock. The percentage of sheep originally exhibiting significant serum levels of anti-T. gondii antibodies (13.9% in the smaller flock and 28.5% in the larger one) as well as the observed levels of seroconversion (22.8% and 7.7%, respectively), indicated a high prevalence of this infection in the north-west of Uruguay. In addition, birth rates of seroconverted sheep in the larger flock were significantly different from those of non-seroconverted animals. These results, although preliminary, suggest that Toxoplasma infection would produce considerable economic losses in extensive ovine production in Uruguay.
在乌拉圭西北部两个羊群的绵羊怀孕期间的5个月内，通过乳胶凝集试验分析了特异性抗弓形虫抗体：一个羊群（79只绵羊）采用集约化管理系统饲养，另一个羊群（494只绵羊）采用粗放式管理系统饲养。使用乳胶试验获得的滴度与通过间接免疫荧光获得的滴度相关。通过腹腔镜检查确认了较小羊群中所有绵羊的妊娠情况，并通过测定较大羊群中血清转化绵羊的血清孕酮水平来确认妊娠。最初表现出显著血清抗弓形虫抗体水平的绵羊百分比（较小羊群中为13.9%，较大羊群中为28.5%）以及观察到的血清转化率（分别为22.8%和7.7%）表明，这种感染在乌拉圭西北部普遍存在。此外，较大羊群中血清转化绵羊的出生率与未血清转化动物的出生率有显著差异。这些结果虽然是初步的，但表明弓形虫感染会给乌拉圭的粗放式养羊业带来相当大的经济损失。
