1920's, when 25 to 35 per cent of 

 the flocks were found to be infected. 

 The 60 reacting birds constitute but 

 .004 per cent of the birds tested. 



F. E. Allen, d.v.m. 



A. C. CORBETT, D.V.M. 



G. p. Faddoul, d.v.m. 



Infectious Bronchitis and New- 

 castle Tests and Service. As infectious 

 bronchitis virus is not propagated by 

 any commercial laboratory because 

 of regulations against interstate 

 shipment of the same, it has been 

 necessary for this department to 

 produce this material for the poul- 

 trymen of the state. The poultrymen 

 inoculate their birds with the virus 

 and produce the disease and a sub- 

 sequent immunity. This is done at 

 a favorable period during the grow- 

 ing stage of the bird so that it enters 

 the laying house protected against 

 the production-destroying effects of a 

 natural outbreak of infectious bron- 

 chitis. The bronchitis virus is pro- 

 duced in embryonating eggs and 

 after being harvested is kept in a 

 frozen state until called for by the 

 poultrymen. About 300 poultrymen 

 have procured the material during 

 the fiscal year. 



Since one cannot absolutely differ- 

 entiate between infectious bronchitis 

 and Newcastle disease outbreak with- 

 out resorting to complex laboratory 

 testing we have offered this service 

 to New Hampshire poultrymen. The 

 tests are based on the imnmne bodies 

 found in the blood stream of the bird 



after recovery takes place. It is of 

 value, even though the bird has re- 

 covered, because it indicates to the 

 poultryman which disease is on his 

 premises. The 589 flocks which were 

 tested for puUorum disease were also 

 checked for Newcastle disease by 

 pooling blood serum from the puUor- 

 um blood samples and submitting this 

 to test. In addition, a considerable 

 number of Newcastle tests were con- 

 ducted on birds submitted for rou- 

 tine autopsy service. 



About 25 flocks were checked for 

 their susceptibility or immunity to 

 bronchitis. Embryonating eggs have 

 to be used for this test and it takes 

 a period of five or six days to com- 

 plete the work. 



F. E. Allen, d.v.m. 



A. C. CoRBETT, D.V.M. 



G. P. Faddoul, d.v.m. 



Diagnostic Service Performed at 

 the Poultry Laboratory. From July 

 1, 1943 to June 10, 1949, a total of 

 4026 specimens of all kinds was sub- 

 mitted to the Poultry Laboratory for 

 diagnosis. These represented 1571 

 diagnoses. 



A total of 3822 chicken specimens 

 and 126 turkeys and 13 miscellan- 

 eous birds were examined. Forty- 

 four cases, consisting of 65 speci- 

 mens from various animals, were al- 

 so handled by the laboratory per- 

 sonnel. 



A tabulation of the cases handled 

 follows: 



Summary of Poultry Autopsies Performed at the Poultry Pathology Laboratory 



During 1948-1949 



39 



