STUDIES ON AN UNCOMPLICATED CORYZA OF THE DOMESTIC FOWL : IV. SUSCEPTIBILITY AFTER EXTRANASAL INJECTION OF THE FOWL CORYZA BACILLUS.

Intratracheal, intracloacal, and subcutaneous injection of living cultures of the fowl coryza bacillus had no demonstrable effect on the susceptibility of fowl to coryza. Intraperitoneal injection was irregularly followed by a definitely altered susceptibility. Growth of the specific bacillus was inhibited in the nasal tract of approximately 70 per cent of 25 birds which had received an earlier intraperitoneal injection.