Waldeland H
Acta Vet Scand. 1976;17(4):403-11. doi: 10.1186/BF03547895.
The presence of Toxoplasma gondii in the diaphragm was correlated with the dye test titres in 174 sheep. In 94 of these the presence of the parasite was also correlated with the haemoglobin (Hb) type. T. gondii was recovered from 3 % of the sheep with titres < 1/16, compared with 30 % of those with titres 1/16 and 70 % of those with titres ≥ 1/32. The results indicate that the distinction between serologically positive and negative individuals at a final serum dilution of 1/16 is justified. Some evidence was found that the parasite is easier to recover from dye test positive mature sheep than from dye test positive lambs. Of the 174 sheep, 143 were examined at random among 186 sheep culled or cast for age during a 4-year period from 1 flock in which the prevalence of Toxoplasma antibodies was representative for flocks in the southern Norway, and T. gondii was recovered from 53 (37 %) of these. It was concluded that 10—15 % of the lamb carcases and 25—37 % of the carcases from mature sheep in this country have T. gondii in their muscles detectable by the peptic digestion technique. A possible genetical influence on the infection was indicated by the higher frequency of recoveries of T. gondii from sheep with Hb type B than from sheep with the Hb types A or AB, but the number of individuals with Hb type B was too small to demonstrate statistically significant differences. The epidemiological importance of infected sheep carcases is discussed.
在174只绵羊中，膈肌中弓形虫的存在与染料试验滴度相关。其中94只绵羊中，寄生虫的存在也与血红蛋白（Hb）类型相关。在染料试验滴度<1/16的绵羊中，3%的羊体内检测到弓形虫，而滴度为1/16的绵羊中这一比例为30%，滴度≥1/32的绵羊中为70%。结果表明，在最终血清稀释度为1/16时区分血清学阳性和阴性个体是合理的。有证据表明，从染料试验阳性的成年绵羊中比从染料试验阳性的羔羊中更容易检测到寄生虫。在174只绵羊中，从186只因年龄原因被淘汰或宰杀的绵羊中随机选取143只进行检查，这186只绵羊来自挪威南部一个弓形虫抗体流行率具有代表性的羊群，其中53只（37%）检测到弓形虫。得出的结论是，该国10%-15%的羔羊 carcasses 和25%-37%的成年绵羊 carcasses 的肌肉中可通过胃蛋白酶消化技术检测到弓形虫。与Hb类型A或AB的绵羊相比，Hb类型B的绵羊中弓形虫的检出频率更高，这表明可能存在遗传对感染的影响，但Hb类型B的个体数量太少，无法证明统计学上的显著差异。文中讨论了感染绵羊 carcasses 的流行病学重要性。 （注：carcasses 一般指畜体、胴体，这里直接保留英文未翻译是因为不清楚原文准确含义，可能是特定语境下的专业表述未找到合适中文替代）
