POULTRY DISEASES AND THEIR TREATMENT 
6. Disinfection 
The important part played by micro-or- 
ganisms in causing and spreading disease 
must be understood before the value of dis- 
infection can be fully appreciated. The 
poultryman must develop a sense of sight 
that sees lurking microbes at every turn, 
especially in unclean corners. Figure 5 
shows germs revealed by the microscope in 
the excrement of a bird suffering from 
Fic. 5.—HOW DISEASE IS SPREAD 
Germs of tuberculosis in the excrement of a fowl. (After Edwards.) 
Io 
