104 PRINCIPLES AND PRACTICE OF MILK HYGIENE 



udder or with open, discharging actinomycotic tumors. 

 Milk from cows in the latter condition is further objec- 

 tionable because it may contain pus and pyogenic or- 

 ganisms, and, in advanced cases, for the additional reason 

 that the general condition is affected, the animal becom- 

 ing emaciated, weak and dull. 



MILK SICKNESS OR TREMBLES 



Cattle and horses when pastured on certain lands in 

 circumscribed areas in the United States develop a dis- 

 ease known as milk sickness or trembles. Its etiology 

 has been the subject of much speculation and investiga- 

 tion. In 1907 Jordan and Harris isolated in pure culture 

 from the blood and organs of animals dead of the disease 

 a spore-forming bacillus with which they succeeded in 

 reproducing the disease in experimental animals. They 

 have given this organism the name of Bacillus lactimorbL 

 The principal symptoms of the disease are violent trem- 

 bling and great restlessness, followed by paralysis. The 

 animal may fall and die suddenly, but usually it lies sev- 

 eral days in a paralyzed condition. The disease is trans- 

 mitted to man through the milk, butter, and meat from 

 affected animals. The symptoms in man are severe 

 vomiting, difficult breathing, subnormal temperature, 

 paralysis, and death. 



II. DISEASES OF CATTLE WHICH MAY RENDER MILK 

 HARMFUL TO MAN. 



INFLAMMATION OF THE UDDER MASTITIS 



Cows are very frequently affected with mastitis, a 

 disease of great economic as well as hygienic importance. 

 There are three forms of the disease : ( 1 ) Catarrhal mas- 

 titis, which may be either mucous or purulent, and which 



