494 CONTAGIOUS EPITHELIOMA 
3. Harrison AND Strerr. Roup. Am. Vet. Review, Vol. XXVII (1903), p. 26. 
4. Harrison anp Srreit. Roup: An experimental study. Bulletin 132. 
Ontario Agric. Coll. and Exp. Farm, 1903. 
5. Houmes. An outbreak of diphtheria associated with a similar disease among 
fowls and a vesicular eruption on the udders of cows. Jour. of Comp. Path. and Therap., 
Vol. XVII (1904), p. 1. 
6. Lorrrier. Untersuchungen tiber die Bedeutung der Mikro-organismen fir 
die Entstehung der Diphtherie beim Menschen, beider Taube und beim Kalbe. Mittheil. 
a. d. Kaiserlichen Gesundheitsamte, Bd. II (1884), S. 421. 
7. Lorre et Ductovux. Contributions a |’ étude de la diphtérie aviaire en Tunisie. 
Ann. del Inst. Pasteur, Vol. VITI (1894), p. 599. 
8. Mack. The etiology and morbid anatomy of diphtheria in chickens. Am. 
Vet. Rev., Vol. XXVIII (1905), p. 919. 
9. Moorg. A preliminary investigation of diphtheria in fowls. Bulletin No. 8. 
U.S. Bureau of Animal Industry, 1895. 
10. Ransom. Manson’s eye worm of chickens. Bulletin No. 60. U.S. Bureau 
of Animal Industry, 1904. 
11. Ratz. Versuche mit dem Virusfiltrate der Vogeldiphtherie und der Gefligel- 
pocke. Monatsh. f. praktische Tierheilk., Bd. XXV (1914), S. 41. 
12. Saumon. The diseases of poultry, 1899, p. 216. 
13. Warp. Poultry diseases in California. Proceedings of the Amer. Vet. Med. 
Asso., 1904, p. 164. 
CONTAGIOUS EPITHELIOMA 
Synonyms: Chicken pox; avian variola; fowl] pox; epitheliosis; 
pigeon pox; sore head. 
Characterization. This is a disease of fowls in which there appear 
wart-like nodules varying in size from a millet seed to a large pea on 
the nostrils, openings of the ears, the comb, wattles and eyelids and 
skin surrounding the eyes. They also appear on the buccal mucous 
membrane where they are covered with a whitish yellow exudate. 
Jowett described fowl pox as a highly contagious disease occurring 
frequently as an epizodtic affecting fowls, pigeons, turkeys, geese 
and other birds. 
When the nodules are limited to the skin the disease is usually 
benign. When the mucous membrane of the mouth is affected it is 
more often fatal, death being caused by inanition or asphyxia resulting 
from the extent of the exudates. This form of the disease closely 
resembles roup or diphtheria in chickens. 
Several writers consider chicken pox and diphtheria to be identical 
in etiology. Carnwath, Schmid, Uhlenhuth and Manteufel, Ratz, 
Hutyra and Marek are of this opinion. On the other hand Bordet 
and Fally believe that chicken pox has nothing in common with avian 
diphtheria. Jowett states that the identity of the two diseases is an 
erroneous idea. Haring and Kofoid conclude that there is good evi- 
