Massachusetts 

 A(;ri(TT.tural Expkrlaiext Station 



Bulletin No. 278 December, 1931 



Infectious 



Laryngotracheitis 



Carriers 



By Charles S. Gibbs 



The investigations on infectious laryngotracheitis for the past year 

 at this Station have centered largely around carrier problems and con- 

 trol measures. While the goal has not yet been reached, important 

 advances have been made, and the disease can now be handled under 

 laboratory conditions more effectively than it was a year ago. The 

 results contained in this paper are in no sense complete, but are pub- 

 lished in the hope that poultrymen and others interested in the control 

 of infectious laryngotracheitis may find in them some practical appli- 

 cations under field conditions. 



MASSACHUSETTS STATE C()l>LE(iE 

 AMHERST, MASS. 



