Protection of chickens vaccinated with combinations of commercial live infectious bronchitis vaccines containing Massachusetts, Dutch and QX-like serotypes against challenge with virulent infectious bronchitis viruses 793B and IS/1494/06 Israel variant 2

Isolation and Identification of Infectious Bronchitis Virus from Commercial Chickens

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. ...

h120 and 793/b type vaccine strains combination protects chickens against challenge with qx like infectious bronchitis virus

avian infectious bronchitis (ib) is a widely distributed poultry disease that has huge economic impact on poultry industry. the continuous emergence of new ibv genotypes and lack of cross protection among different ibv genotypes have been an important challenge. the present study was done to evaluate protection caused by two different serotypes’ vaccines (massachusetts & 793/b) in order to eval...

The effect of mixed live vaccines of Newcastle disease and infectious bronchitis on systemic and local antibody responses in chickens

In the present study, 360 male day-old broiler chicks were used to determine the effect of mixed livevaccines of Newcastle disease (ND) and infectious bronchitis (IB) on serum and local antibody responses toIB. Chicks were randomly divided into 12 treatment groups of 3 replicates and reared for 40 days on floorpens. Groups 1 to 5 received mixed ND and IB vaccine. Groups 7 to 11 received IB vacc...

Identification of Different Serotypes of Infectious Bronchitis Viruses in Allantoic Fluid Samples with Single and Multiplex RT-PCR

Background and Aims: Infectious bronchitis virus (IBV) causes an acute, highly contagious respiratory and kidney disease of chickens which results in significant economic losses in commercial broilers, layers and breeders. Rapid identification of IBV serotypes involved in respiratory complex is a problem in the differential diagnosis. Materials and Methods: In this study, a single and mul...