Diseases of the Respiratory System 181 



mucous membrane of the air-sacs and bronchi. When the 

 number of parasites is small they cause no serious inconven- 

 ience to the bird. When there are a large number present 

 they may cause inflammation of the membrane and secretion 

 of mucus or they may seriously obstruct the air passages. 



Treatment. — Treatment of infested birds is probably use- 

 less. Feeding sulphur with the food or compelling the birds 

 to inhale the fmnes of burning sulphur or burning tar or the 

 steam of boiling tar water has 

 been" recommended . 



If a flock is infested with 

 this parasite it is best when 

 possible to start a new flock 

 with incubator chicks raised 

 on a new range and carefully 

 protected from infection from 

 the old flock. Or stock may 

 be purchased from an un- 

 infested flock. Birds with 

 this parasite should not be 

 bought or sold for breeding 



or laying purposes, as the Fig. SS. — CytodUes nudus. The 



flock into which they are in- f/;?'"' ™'*^; ,9^^^^^ enlarged. 

 troduced will become mfested 



from them. Since this parasite cannot live long outside 

 the bird's body, the houses, runs, etc., do not remain in- 

 fested long after all the diseased birds have been removed. 

 ■Prognosis. — A bird once infected is probably never free 

 from the parasite but may live a long time little harmed by 

 its presence. 



