QUESTIONS AND ANSWERS CONCERNING 

 PULLORUM DISEASE 



By H. Van Roekel,' Chief of Laboratory 

 Poultry Disease Control 



Introduction 



Since numerous inquiries concerning pulloruni disease have come to the at- 

 tention of the hiboratory, it has been deemed advisable to present this informa- 

 tion in the form of questions and answers which should serve the needs of the 

 Massachusetts poultry industry. In preparing this bulletin an effort has been 

 made to present the infonration in such a manner that poultryn.en will be able 

 to understand the nature, eradication, and prevention of the disease. 



W/-£CT£iO OilCKS 

 J iA/fi/C^ MAY 



SPREAD i/vrecTioH 



//V MCUBATO/? 



Cycle, or iNrLcrioN 



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CHICKS W g/fOO0£/f flOUZEi 



Figure 1. — Pullorum Disease Infection in a Flock May Follow This Cycle. 

 The disease can be eradicated either by breaking the cycle of infection through 

 eliminating the infected birds by means of the macroscopic agglutination test, or by 

 disposing of the entire infected flock and replacing it with pulloruni disease-free stock. 



'.\ssisted by K. I-. Bullis, O. S. Flint, and .Miriam K. Clarke, .\ppreciatioii is e.xtcnded to Dr. 

 .John B. Lentz, Head of the Department of Veterinary Science, for the suggestions made concern- 

 ing this bulletin. 



