Studies of the Clinical Manifestations and Transmissibility of Infectious Coryza of Chickens

IN 1933 a report (1933) was made of the occurrence on certain poultry farms in California of a severe type of respiratory infection which was looked upon as one not previously differentiated and described. The disease has been observed subsequently on numerous other farms and in the course of an investigation of it, it has developed that it probably is not new but, in the past, has been included with the commonly occurring respiratory troubles known as roup, colds, contagious catarrh, oculo-nasal roup, etc. Since the disease has been shown to be infectious and to consist primarily of an inflammation of the nasal passages the name “Infectious Coryza” has been adopted for it. In studies of the etiology of the disease, which are presented elsewhere (1934 (1936), a hemophilic bacillus was found to be the primary etiological factor. The same or a very closely related organism has also been incriminated . . .