Braunius W W, de Wit J J
Gezondheidsdienst voor Dieren in Gelderland, Velp.
Tijdschr Diergeneeskd. 1990 Mar 1;115(5):207-11.
An outbreak of Gumboro disease occurred at the end of 1988 on a broiler farm having four houses and birds of two different age groups. The infection 'lingered' in the subsequent flocks, a striking feature consisting in the fact that the pattern of disease was identical in almost every case. Symptoms of Gumboro disease were not observed in the compartment housing the oldest broilers. The birds in this house continued to show low titres at the close of the fattening period. Gumboro disease was observed on the 19th and 20th days of life or on the 29th-33rd days of life in the other houses. Mortality was highest in the latter case. The final conclusion is that the difference in age between the houses probably makes the high pressure of infection possible. Consistent vaccination reduced the problem of Gumboro disease on the farm.
1988年底，在一个拥有四个鸡舍且饲养了两个不同年龄组肉鸡的肉鸡场爆发了传染性法氏囊病。感染在随后的鸡群中“持续存在”，一个显著特征是几乎在每种情况下疾病模式都是相同的。在饲养最老肉鸡的鸡舍中未观察到传染性法氏囊病的症状。在育肥期结束时，这个鸡舍中的鸡抗体滴度仍然很低。在其他鸡舍中，传染性法氏囊病分别在鸡龄第19天和第20天或第29至33天被观察到。在后一种情况下死亡率最高。最终结论是，鸡舍之间的年龄差异可能导致了高感染压力。持续的疫苗接种减少了该农场传染性法氏囊病的问题。
