INFLUENCE OF DISEASE UPON MILK 99 
served; in some cases the face has been affected in this 
way. 
Milk from cows affected with cowpox should not be 
used for food. When the disease is enzootic, the healthy 
and diseased cows should be separated and separate 
milkers provided for each class. 'This is especially im- 
portant when the milk is to be used by children. The 
virus of cowpox is destroyed by a temperature of 48° C. 
(119° F.). Milk from infected animals which has not 
undergone any physical change and milk which has been 
exposed to infection may be rendered safe by heating to 
this temperature. 
False Cowpox.—Cowpox should not be confused with 
a condition more commonly affecting the udder which 
is known as false cowpox. In this condition, small nodu- 
lar swellings which may be as large as a pea appear on 
the teats and neighboring parts of the udder, rupture in 
a few days, and then heal under a scab. The teats are 
not hot, swollen or tender and there is no red area around 
the nodules, as in true cowpox; fever is also absent. The 
condition is supposed to be caused by the ordinary pyo- 
genic cocci, which are rubbed into the skin during milk- 
ing or enter through wounds. Cows with teats covered 
with a fine skin seem to be most susceptible. The condition 
may be transmitted from cow to cow by the hands of 
the milker, but is not transmissible to man. The milk is 
not affected except in so far as it may be contaminated 
with purulent matter from the ruptured nodules. There 
is only a small quantity of this material and the con- 
tamination from this source therefore can only be very 
slight. 
Furunculosis of the Udder is sometimes called cowpox 
by dairymen. This condition usually occurs sporadically, 
