present. A sleepy, comatose condition may end in death, or the animal dies
in a convulsion.

_The secretions of the skin_ and mucous membranes are abnormal. The skin in
the regions of the ears, inside of the thighs and under surface of the body
is moist, dirty or discolored red. Just before death the skin over the
under surface of the body becomes a purplish red. In the chronic form, a
dirty, thickened, wrinkled skin is commonly observed. At first the
secretion from the eyes is thin and watery, but it becomes thick, heavy and
pus-like, causing the margins of the lids to adhere to each other.

The death rate in hog-cholera varies in the different forms of the disease.
The average death rate is about fifty per cent.

DIFFERENTIAL DIAGNOSIS.--The diagnosis of hog-cholera in the field must
depend on the clinical symptoms, post-mortem lesions and history of the
outbreak. The history should be that of a highly infectious disease.

[Illustration: FIG. 80.--Carcass of a cholera hog showing different groups
of lymphatic glands; kidneys; and ulcer on caecum.]

_Abnormal body temperatures_ of a large percentage of the herd indicate the
presence of an acute infectious disease. We should then destroy one of the
sick hogs and make a careful post-mortem examination (Fig. 80). An early
diagnosis of the disease is necessary, as this enables us to use curative
treatment when it will do some good, and take the necessary steps toward
preventing the spread of the disease to neighboring herds.

_Intestinal and lung worms_ are common in young hogs. The presence of these
worms does not always indicate that they are the cause of the sickness and