Krogh H V
Ann Rech Vet. 1983;14(4):522-5.
A report is given of a study on the occurrence of enterotoxigenic Escherichia coli in calves in Denmark. Samples from 1379 1-30-day-old calves were examined and ETEC were isolated from 228 samples (16.5%). While in 1-2-day-old calves nearly one half (47.5%) harboured ETEC, the frequency dropped to 3.4% in 8-day-old calves, and of 165 9-30-day-old calves just one was found to harbour ETEC. A field trial with K99-containing bacterins was performed in 14 herds with ETEC problems. A total of 109 cows were vaccinated with a 4-strain bacterin and 73 with a K99-bacterin, while 114 cows served as controls. Sixteen calves from the 4-strain bacterin group, 6 calves from the K99-bacterin group, and 25 calves from the control group, became diarrheic within their first week of life.
本文报告了丹麦犊牛中产肠毒素大肠杆菌（ETEC）的发生情况研究。对1379头1至30日龄犊牛的样本进行了检测，从228份样本（16.5%）中分离出了ETEC。在1至2日龄的犊牛中，近一半（47.5%）携带ETEC，而在8日龄犊牛中，这一频率降至3.4%，在165头9至30日龄的犊牛中，仅发现1头携带ETEC。在14个存在ETEC问题的牛群中进行了含K99菌苗的田间试验。共有109头母牛接种了4菌株菌苗，73头接种了K99菌苗，另有114头母牛作为对照。4菌株菌苗组的16头犊牛、K99菌苗组的6头犊牛和对照组的25头犊牛在出生后的第一周内出现腹泻。
