Studies of Infectious Coryza of Chickens with Special Reference to Its Etiology

THE isolation from the nasal passages of chickens with infectious colds or coryza of a small bacillus with which a coryza of short duration could be produced in healthy chickens has been reported by de Blieck (1932) in Holland, by Nelson (1932) in New Jersey, by Delaplane and Stuart (1934) in Rhode Island, by Eliot and Lewis (1934) in Maryland, and by Schalm and Beach (1934) in California. Nelson stated that the bacillus failed to grow on open blood agar plates but did so when the plates were sealed with clay. De Blieck, Delaplane and Stuart, and Eliot and Lewis experienced no difficulty in growing their organisms aerobically on blood agar but the latter stated that growth was favored by incubation in an atmosphere containing an excess of carbon dioxide. Schalm and Beach, however, obtained no growth of the organism under aerobic conditions but succeeded when they employed an atmosphere . . .