Mucosal, Cellular, and Humoral Immune Responses Induced by Different Live Infectious Bronchitis Virus Vaccination Regimes and Protection Conferred against Infectious Bronchitis Virus Q1 Strain

Protection conferred by commercial infectious bronchitis (IB) vaccines against

The level o protection conferred by commercial vaccines against the new variant Nebraska 95 isolate was evaluated. Complete protection was observed when the IBV Arkansas vaccine was given and when the Massachusetts-Connecticut vaccine was given at 1 and at 1 and 10 days of age. However, partial protection was observed when the Massachusetts-Connecticut vaccine was given only at 10 days of age. ...

Vaccination against infectious bronchitis virus: A continuous challenge.

Infectious bronchitis virus (IBV) is a significant respiratory pathogen of commercial poultry that causes millions of dollars in lost revenue worldwide each year. Even though the poultry industry extensively vaccinates against IBV, emergence of new serotypes and variants continually occur, making control of the disease difficult. Current mass application strategies for IBV vaccines are ineffici...

Isolation and Identification of Infectious Bronchitis Virus from Commercial Chickens

Avian infectious bronchitis virus.

Infectious bronchitis virus (IBV) is prevalent in all countries with an intensive poultry industry, with the incidence of infection approaching 100% in most locations. Vaccination is only partially successful due to the continual emergence of antigenic variants. At many sites, multiple antigenic types are simultaneously present, requiring the application of multiple vaccines. Although many coun...

Molecular Cloning and Expression of Nucleocapsid Gene of Chicken Infectious Bronchitis Virus Strain Massachusetts H120

Chicken infectious bronchitis virus (IBV) causes severe respiratory and renal dysfunction in chickens. In the present study, we used reverse transcription-polymerase chain reaction (RT-PCR) to amplify the nucleocapsid (N) protein gene of strain Massachusetts (Mass) H120 of IBV that is commonly used in the vaccine production in Iran. The PCR product with the expected size of 1.2 kb was cloned in...