flock to purchase from than one which has passed only one negative test. These 

 observations also point out that one must guard against infection constantly 

 from the time eggs have been placed in the incubator, during the time the chicks 

 are being reared, and while the adult birds are in the breeding pens. It is obvious 

 that the importance and value of annual testing can not be overemphasized when 

 one considers these "breaks." 



Table 4. Appearance of Infection in Flocks Previously Negative 



♦Represents retests. 

 fRepresents partial test 



Poultrymen will benefit greatly through continuous and adequate observance 

 of the following control, eradication, and prevention measures: 



1. All the birds on the premises should be tested each year. 



2. If infection is present, the entire flock should be retested within four to 

 six weeks until a negative report is obtained, provided the value of the birds 

 justifies the expenditure. 



3. Every reactor, regardless of its value, should be removed from the premises 

 and sold for slaughter immediately upon receipt of the report. 



4. Offal from all birds dressed for market or home consumption as well as 

 dead birds that are not fit for consumption should be burned. 



5. The poultry houses, runs, and equipment should be thoroughly cleaned 

 and disinfected immediately after removal of reactors, using disinfectants approved 

 by the United States Department of Agriculture. An empty pen in each house 

 facilitates cleaning and disinfection during the winter months. 



