State Service 



Avian Respiratory Disease Research 



In order to initiate a research pro- 

 gram on respiratory diseases, various 

 isolations from specimens submitted 

 lo the poultry diagnostic laboratory 

 have been obtained and filed in a 

 libirary for experimental use. The 

 specimens have been obtained from 

 all parts of the state. During the 

 period of January 1, 1951, to June 

 30, 1951, the following isolations 

 have been made: 11 of Newcastle 

 Disease and 10 of Infectious Bron- 

 chitis. 



W. R. DUNLOP 



Diagnostic Service of 

 The Poultry Laboratory 



A total of 10,117 specimens of all 

 kinds was submitted to the Poultry 

 laboratory during the two years 

 from July 1, 1949, to June 30, 1951. 

 These represented 3,445 cases. 9,104 

 chicken specimens, 496 turkeys, and 

 38 miscellaneous birds were ex- 

 amined. 148 specimens from animals 

 other than birds were handled at the 

 laboratory, 



A summary of the tabulation of 

 chicken and turkey cases follows: 



Differential Diagnosis 

 Of Nev/castle Disease 



The hemagglutination-inh(lbition 

 test was performed on pooled serum 

 obtained from all pullorum samples 

 submitted to this laboratory. During 

 the past two years 1,918 such tests 

 have been completed. 1,276 of the 

 serum samples were positive, which 

 indicates that the birds have been 

 vaccinated or have experienced New- 

 castle disease. 642 were found to be 

 susceptible. The results indicate that 



F. E, Allen, A. C. Corbett, 



G. P. Faddoul, W. R. Dunlop 



the poultrymen of New Hampshire 

 are aware of the necessity of adopt- 

 ing a Newcastle vaccination program. 

 In much the same manner, serum 

 neutralization tests for infectious 

 bronchitis were applied to various 

 pooled samples. During the 2-year 

 period, 390 serum neutralization 

 tests were run and of these 238 were 

 found positive, indicating that they 

 had experienced infectious bronchit- 

 is. 



W. R. DuNLOP 



A. C. Corbett 



42 



