REDUCING INFECTION. 



The number of cases of bacillary white diarrho'a is being reduced each year. From 

 a review of the data obtained during the past year, there are indications of improve- 

 ment among the breeding fiocks in the State as a result of the testing work. 



Of the 110 flocks tested during 1921-22, 27 were found to be free from bacillary 

 white diarrhoea. It is not easy to rid flocks of this disease, especially if the original 

 infection is great. It can be seen from Table VI that the infection maj^ be eliminated 

 by testing the original birds, the progeny, and the progeny of the progeny; which 

 means that elimination is possible onl}^ after a series of tests. 



Table VI. Reduction of Percentage Infection as determined by Testing 

 Work on 18 Different Flocks, 1919-21. 



' In this case the original flock was not tested until 1920; 

 yet been made. 



hence, the test on the progeny of progeny has not 



PLANS FOR THE COMING YEAR. 



Plainly, the poultry disease elimination law requires such form of organization as 

 will insure the elimination of certain diseases from the poultry flocks of the State. 

 With the beginning of the 1922-23 season, service under this law will be given only on 

 condition that the recipients of the service agree to comply with certain rules and 

 regulations designed to further the work of elimination. The requirements have been 

 formulated to correlate the scientific laboratory work with practical phases of the 

 problem as it is found in the field. Each poultrjTTian recei\'ing the services of the 

 Department of Veterinary Science and Animal Pathology of the Massachusetts Agri- 

 cultural Experiment Station in performing the agglutination test is requested to co- 

 operate in eliminating bacillary white diarrhoea from his breeding flocks, and ulti- 

 mately from his poultry plant, by adopting one of the following plans for testing, and 

 by observing the precautions listed under "Control Measures." 



