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.