Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium.
Vet Rec. 2011 Sep 10;169(11):278. doi: 10.1136/vr.d4406. Epub 2011 Aug 10.
The prevalence of respiratory pathogens in diseased veal calves was determined in 24 respiratory disease outbreaks in 15 herds in Belgium. Bacteria were cultured from nasopharyngeal swabs and seroconversion against viruses and Mycoplasma bovis was determined on paired sera. At the individual calf level, Mycoplasma species, Mannheimia haemolytica and Pasteurella multocida, were isolated from 70.5 per cent, 21.5 per cent and 26.0 per cent of swabs, respectively. At the herd level, the presence of M bovis could be confirmed in 84.6 per cent of the herds examined. Seroconversion against bovine viral diarrhoea virus (BVDV) was present in 71.4 per cent of herds, parainfluenzavirus type 3 in 53.3 per cent, bovine respiratory syncytial virus in 40.0 per cent, bovine adenovirus type 3 in 46.7 per cent, bovine coronavirus in 30.0 per cent, and bovine herpesvirus type 1 in 26.7 per cent. At postmortem examination, Mycoplasma species could be cultured from 61.9 per cent of pneumonic lungs (n=21). Sixty per cent of calves tested were positive for BVDV (n=20), and 20.0 per cent were positive for bovine respiratory syncytial virus (n=16).
在比利时的 15 个牛群中，24 次呼吸疾病爆发共检测了 24 头患病小牛肉牛，确定了呼吸道病原体的流行情况。从鼻拭子中培养细菌，并对配对血清检测病毒和牛支原体的血清转化。在个体小牛水平上，从 70.5%、21.5%和 26.0%的拭子中分别分离出支原体属、溶血性曼海姆菌和多杀巴斯德菌。在牛群水平上，在所检查的 84.6%的牛群中可以证实存在牛支原体。71.4%的牛群出现牛病毒性腹泻病毒（BVDV）血清转化，53.3%的牛群出现副流感病毒 3 型，40.0%的牛群出现牛呼吸道合胞体病毒，46.7%的牛群出现牛腺病毒 3 型，30.0%的牛群出现牛冠状病毒，26.7%的牛群出现牛疱疹病毒 1 型。在剖检时，从 61.9%的肺炎肺（n=21）中可以培养出支原体属。60%的受检小牛为 BVDV 阳性（n=20），20%的小牛为牛呼吸道合胞体病毒阳性（n=16）。
