156 Diseases of Poultry 



cited by several European investigators.^ On the other 

 hand Haring and Kof oid ^ and Sweet ^ and Fally * believe 

 that there is convincing evidence that sore-head is dis- 

 tinct from the roup diseases. These questions cannot be 

 settled with the present knowledge of the causes of these 

 diseases. The probability is that there are at least three 

 diseases although each of them may under certain conditions 

 produce lesions similar to those of either of the other two. 

 In fact the disagreement in the results of different investi- 

 gators suggests that there may be several contagious diseases 

 which produce nearly identical lesions. In the present work 

 nasal roup, diphtheritic roup, and chicken pox will be dis- 

 cussed as separate diseases. 



Nasal Roup or Contagious Catarrh 



The disease called "roup" by poultrymen is a contagious 

 catarrh. It attacks principally the membranes lining the eye, 

 the sacs below the eye (infra-orbital sinuses), the nostrils, the 

 larynx, and the trachea. 



Diagnosis. — The general characteristics of the disease 

 have been very well described by Salmon. The symptoms 

 first seen are very similar to those of an ordinary cold, but 



1 Carnwath, T., Arb. K. Gsndhsamt. Orig. 27, pp. 388-402. 1907. 

 Schmid, G., Centbl. Bakt, etc., Orig. 62, pp. 200-234. 1909. Ratz, I., 

 Allotorvosi Lapok, Vol. 33, pp. 184H86. 1910. Sigwart, H., Centbl. 

 Bakt., etc., Orig. 66, pp. 428-464. 1910. Ulilenhutli and Manteufel. 

 Arb. K. Gsndhsamt., Vol. 38, pp. 288-304. 1910. von Betegh, L., 

 Centbl. Bakt, etc. , Orig. 67, pp. 43-50. 19 12. von Katz, S. , Monatsch. 

 Prakt. Tierheilk., Vol. 25, pp. 41-46. 1913. 



^ Haring, C. M., and Kofoid, C. A., " Observations concerning 

 the Pathology of Roup and Chicken Pox." Amer. Vet. Rev., Vol. 

 40, pp. 717-728. 1912. 



' Sweet, C. D., " A Study of Epithelioma Contagiosum of the 

 Common Fowl." Univ. of Col. Pubs. Zool., Vol. 11, pp. 29-51. 

 1913. 



^ Fally, V. Ann. Med. Vet., Vol. 57, pp. 68-75. 1908. 



