Nabbut N H, Khatib I H
Avian Dis. 1978 Jan-Mar;22(1):10-5.
The virulence of 66 Escherichia coli strains was evaluated in 12-day-old chicken embryos inoculated by the allantoic route. The index of virulence used was the proportion of dead embryos within 3 days of inoculation. The strains were classified into "highly virulent," "moderately virulent," and "avirulent" groups. Although both virulent and avirulent strains grew equally well in vivo in the allantoic and yolk sacs, virulent E. coli invaded the whole embryo but avirulent ones failed to do so.
通过尿囊途径接种12日龄鸡胚，对66株大肠杆菌的毒力进行了评估。所使用的毒力指标是接种后3天内死亡胚胎的比例。这些菌株被分为“高毒力”、“中度毒力”和“无毒力”组。尽管有毒力和无毒力的菌株在尿囊和卵黄囊中在体内生长情况相同，但有毒力的大肠杆菌会侵入整个胚胎，而无毒力的则不会。
