Hellmann E, Staak C, Baumann M
Tropenmed Parasitol. 1984 Jun;35(2):123-6.
During a serological Brucella survey in Bahr el Ghazal Province (Southern Sudan), 6.5% of a total of 5982 randomly selected cattle of the Dinka tribe from 303 herds investigated showed positive results. Herds of bigger size were found to be more frequently infected than smaller herds. From 1228 randomly selected cattle of the Fellata tribe (Red Bororo race), 22.5% produced a positive reaction. Here, reactors were detected in 71 from a total of 72 herds tested (98.5%). Among the Dinka cattle, the number of reactors rose steadily in correspondence to the age of the animals. A somewhat more pronounced increase of reactors was observed in animals 4-8 years of age. On the other hand, the number of reactors in the Fellata herds increased rapidly between the age of 2-4 years. Thereafter, this infection rate did not change significantly any more. The results indicated that a significant portion (37.1%) of reactors graded positive (n = 665) expressed only low titers (less than or equal to 1:40) in the SAST. Those titers were even more numerous (49.1%) among the positive reactors belonging to cattle below the age of 4 years.
在加扎勒河省（苏丹南部）进行的布鲁氏菌血清学调查中，对来自303个畜群的5982头随机挑选的丁卡部落牛进行检测，结果显示6.5%呈阳性。发现规模较大的畜群比规模较小的畜群感染更为频繁。在随机挑选的1228头费拉塔部落（红博罗罗品种）牛中，22.5%呈阳性反应。在总共检测的72个畜群中，有71个畜群检测到阳性反应动物（98.5%）。在丁卡牛群中，阳性反应动物的数量随着动物年龄的增长而稳步上升。在4至8岁的动物中观察到阳性反应动物数量的增长更为明显。另一方面，费拉塔畜群中阳性反应动物的数量在2至4岁之间迅速增加。此后，这种感染率不再有显著变化。结果表明，在阳性反应动物（n = 665）中，相当一部分（37.1%）在标准试管凝集试验中仅表现为低滴度（小于或等于1:40）。在4岁以下牛的阳性反应动物中，这些低滴度的数量甚至更多（49.1%）。
