Pathogenicity of LCB to KM mice was high through intraperitoneal injection, as well as to one day old chicks through intracranial injection. Nonpathogenicity was shown to chicks through intraperitoneal and intratracheal inoculation.

• 该菌株腹腔接种对 K M小鼠具有高致病性 ,脑内接种对 1日龄雏鸡也具高致病性 ,但对鸡腹腔及气管接种则无致病性。