References
- Davelaar , F.G. and Kouwenhoven , B. 1976 . Changes in the Harderian gland of the chicken following conjunctival and intranasal infection with infectious bronchitis virus in 1‐ and 20‐day‐old chickens . Avian Pathology , 5 : 39 – 50 .
- Davelaar , F.G. and Kouwenhoven , B. 1977 . Influence of maternal antibodies on vaccination of chicks of different ages against infectious bronchitis . Avian Pathology , 6 : 41 – 50 .
- Lombardi , D. , Coaro , R. and Buzzaccaro , E. 1977 . Vaccination of broiler fowl with high egg passage infectious bronchitis vaccines . Clinica Veterinaria , 100 (6) : 424 – 430 .
- Pejkovski , C. , Davelaar , F.G. and Kouwenhoven , B. 1979 . Immunosuppressive effect of infectious bursal disease virus on vaccination against infectious bronchitis . Avian Pathology , 8 : 95 – 106 .