This new laboratory 

 building occupied 

 in 195 1 was built 

 to provide needed 

 facilities and space 

 for increased serv- 

 ices and research 

 requested by the 

 livestock industry. 



Newcastle disease was first recog- 

 nized on the Eastern Seaboard in 

 1945. Infectious bronchitis, which 

 is quite similar, was an important 

 respiratory infection at the time, 

 and the recognition of the impor- 

 tance of chronic respiratory disease, 

 still another similar disease, about 

 1950 added to the diagnostic prob- 

 lems. Microscopic examination of 

 tissues is also being used with in- 

 creased effectiveness. 



Bronchitis Control 



A control program for infectious 

 bronchitis was initiated in 1941 

 after many years of failure to 

 eradicate the disease and to de- 

 velop a satisfactory vaccine. After 

 1955 when it appeared that a suit- 

 able vaccine was available, contin- 

 uation of the program was unneces- 

 sary. Up to 1,193 flocks, including 

 3,136,588 birds were involved each 

 year inider this program. 



A laboratory testing service for 

 mastitis — probably the Number 

 One health disturbance of dairy 

 cattle — began in 1946 at the re- 

 quest of the dairy industry. 



Economically and scientifically 

 significant research results have 

 been forthcoming, particularly in 

 the fields of pullorum disease, the 

 avian leukosis complex, Newcastle 

 disease, infectious bronchitis, and 

 chronic respiratory disease. 



Major emphasis during the past 

 15 years has been on respiratory 

 infections. The control program 

 for infectious bronchitis in use 

 from 1941 to 1956 was an out- 

 growth of research. 



Ne>vcastle Program — a Success 



The first successful immuniza- 

 tion program for Newcastle disease 

 using a live virus was introduced 

 in 1948. Since then, mass methods 

 of applying Newcastle and infec- 

 tious bronchitis vaccines have re- 

 ceived particular attention. This 

 was done by applying vaccines as 

 a spray to flocks. Current efforts 

 are being directed towards dusts 

 and water methods. Research men 

 are also trying to develop more ef- 

 fective vaccine preparations. 



The department has contributed 

 greatly to the increased knowledge 

 of chronic respiratory disease, par- 

 ticularly in relation to its natine, 

 causative agent, transmission 

 via the egg. and means of handling. 

 Today animal research is concerned 

 with unusual types of mastitis in 

 dairy cows and with leptospirosis, a 

 newly recognized disease of consid- 

 erable economic significance. 



The future of veterinary science 

 rests in the cooperation of the poul- 

 try and animal industries, a neces- 

 sary jjart of any organized effort to 

 eradicate or control animal disease. 



