MICROBIAL DISEASES OF MAN AND DOME.STIC ANIMALS 783 



It is conceded that tubercle bacteria do not multiply in nature out- 

 side the animal body and, therefore, dissemination must depend wholly 

 upon the dissemination of infected people or 

 animals and materials infected by diseased 

 men and animals. Tubercle bacteria escape 

 from open ulcers or from tubercular lesions 

 which connect with digestive or respiratory 

 organs. They may reach the surface in other 

 ways; e.g., by the discharge of abscesses. 



In controlling tuberculosis among humans 

 at the present time, several methods are in 

 vogue. In some localities, an effort is made 

 to segregate tuberculous patients during the 

 day for the purpose of treating them as well 

 as teaching them how to care for themselves. 

 This method aims to instruct how to .prevent 

 dissemination and transmission of the disease, 

 to prepare suitable nourishment, and to secure 

 the advantages of open-air influences. This 

 instruction not only extends to the patients 

 but others with whom the patients may 

 mingle. Sanitaria are also constructed to 

 receive patients suffering from the disease, 

 and care for them under suitable medical 

 supervision by proper treatment, nourish- 

 ment, and open-air life. Again, the policy 

 is being inaugurated to instruct tuberculous 

 patients, where it is impossible to reach 

 them by other means, to care for themselves 

 in their own homes. 



By these general hygienic measures, much 

 good has been accomplished, not only for the 

 patients but, also, in a diminution of the 

 number of new cases developing. 



The animal disease is carried to distant 

 points, most commonly by breeding stock. 

 Locally the disease spreads either by the 

 movement of affected cattle, or freijuently 



Fig. 165. — Bad. tubercu- 

 losis. Glycerin agar culture. 

 (After Curtis from Stitt.)' 



