CCENUROSIS (GID, STURDY, TURN-SICK). 



469 



has recorded cases where fifty, one hundred, and even four hundred 

 lambs of one flock \Yere affected. The enormous mortahty in such cases 

 IS very apt to cause errors in diagnosis. Ccenurosis occurs most fre- 

 quently during rainy seasons, moisture favouring the preservation of 



«• 



Fig. 215. — Skull of a sheep showing the brain infested with a gid bladder- 

 worm [Ccemirus cerehralis). Two-thirds natural size. 



the eggs. Young animals become infected, particularly during the 

 spring and autumn, more rarely in the summer, as prolonged desicca- 

 tion, say for a period of twelve to fifteen, days, destroys the vitality 

 of the eggs, but animals may become infested at any time through 

 drinking contaminated water. Moussu has seen ccenurosis (acute 

 encephalitis) from the last-named cause in the middle of January. 



