THE DOG AS A CARRIES OF PARASITES AND DISEASE. 
£„... 
GID. 
Gid disease, like hydatid disease, is due to the presence of a blad- 
der worm, or larval tapeworm, in the tissues. The bladder worm 
(known as Multiceps multiceps or Ccenurus cerehralis) (fig. 4) which 
causes gid resembles the hydatid bladder worm in that one bladder 
worm may produce large numbers of tapeworm heads, and the tape- 
worms resulting from these heads occur in the intestines of dogs, 
as in the case of the hydatid tapeworm. The bladder worm caus- 
ing gid differs from the hydatid in that it has a thin, delicate, 
membranous wall in- 
stead of a thick lam- 
inated wall; it does 
not produce daughter 
cysts as the hydatid 
does, and it occurs 
only in the brain 
and spinal cord in- 
stead of in any tis- 
sue. The adult tape- 
worm in the dog, 
commonly known as 
Tcenia ccenurus (fig. 
5) attains a length 
of 2 or 3 feet instead 
of a small fraction of 
an inch. 
Gid is principally 
a disease of sheep, 
though it is fairly 
common in cattle and 
there are some cases 
from the horse and 
the goat. In 1910 x 
the writer stated that there were no valid cases of the disease in 
man. Since then Brumpt - has published one case which apparently 
must be accepted as a good case. 
The life history of the gid parasite is practically the same as that 
of the hydatid. The gid bladder worm is called a ccenurus. When 
this coenurus is eaten by a dog, the tapeworm heads on the ccenurus 
pass to the intestine of the dog and give rise to a tapeworm which 
Fig. 4. — Brain of giddy sheep, showing gid parasite, a, Gid 
parasite or bladder worm ; b, heads on bladder worm. 
(After Numan, 1850, PI. I, fig. 1.) 
1 The gid parasite and allied species of the cestode genus Multiceps. I. Historical 
review. By Maurice C. Hall. Bureau of Animal Industry Bulletin 125, pt. 1. 
2 Precis de parasitologic, 2d ed., pp. 
94288°— Bull. 260—15 2 
281-283. 1913. 
