Lethality in 1-day-old chicks for intratracheal inoculation with APEC isolates.

aNegative control for chick colisepticemia model.bPositive control for chick colisepticemia model.cData mean the number of dead chicks/total number of chicks tested.dData mean the number of chicks from which the APEC strain was reisolated/total number of chicks tested.eMean of lesion scores (ranked from 0 to 3 due to occurrence of airsacculitis, pericarditis, and perihepatitis) for 10 chicks tested.fValues are not significantly different (P≥0.05 by Fisher's exact test) with the negative control.Lethality in 1-day-old chicks for intratracheal inoculation with APEC isolates.a. 鸡大肠杆菌败血症模型的阴性对照。 b. 鸡大肠杆菌败血症模型的阳性对照。 c. 数据为受试雏鸡的死亡数与受试雏鸡总数量的比值。 d. 数据为从体内重新分离到禽致病性大肠杆菌（Avian Pathogenic E. coli, APEC）菌株的雏鸡数与受试雏鸡总数量的比值。 e. 10只受试雏鸡的病变评分均值（根据气囊炎、心包炎与肝周炎的发生情况，评分范围为0至3）。 f. 与阴性对照组相比，差异无统计学意义（费希尔精确检验，P≥0.05）。 禽致病性大肠杆菌分离株经气管内接种1日龄雏鸡的致死性情况。