MASSACHUSETTS 

 AGRICULTURAL EXPERIMENT STATION 



Control Series Bulletin No. 108 May, 1941 



Twenty-first Annual Report on 



Eradication of Pullorum Disease 



in Massachusetts 



By the Poultry Disease Control Laboratory 



This bulletin reports results of pullorum disease testing for the 1940-41 

 season. Of the 527,328 birds tested, 492,475 were identified with non- 

 reacting flocks. In six counties, all the tested flocks were classified as 

 non-reacting. No reactors were detected among flocks tested in Worcester 

 County, which led in the number of tested birds (89,041). Fewer "breaks" 

 were encountered than during the previous season. The average percent- 

 age of infection (0.09) was the lowest in the testing history. These results 

 indicate gradual progress in the establishment and maintenance of flocks 

 free of pullorum disease. 



MASSACHUSETTS STATE COLLEGE 



AMHERST, MASS. 



