This experiment was conducted by using (32000) chicks classified into three houses (18000 chicks in first house, 5000 chicks in second house and 9000 chicks in third house). The first group was inoculated with inactivated oil emulsion vaccine contain NDV (La Sota) and AIV (H9N2) subcutaneous at one day, in the same time vaccinated with mixed vaccine of NDV (La Sota) and IBV H120 by spraying rou...

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...

Due to variations in serotypes among different strains of avian infectious bronchitis viruses (IBV), vaccination of chicks with imported vaccines fails to protect them from IBV infections in Taiwan. Therefore, we develop attenuated vaccines from local strains in Taiwan. A Taiwan Group I (TW I) strain was passaged 74 times through specific pathogen-free (SPF) chicken embryonated eggs, and then t...

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. ...

The aim of this study was to investigate the prevalence and diversity of infectious bronchitis virus (IBV) genotypes in poultry flocks in 16 areas of Morocco between 2010 and 2014. A total of 360 chicken flocks suspected of being infected by IBV were screened for the IBV N gene using real-time reverse transcriptase-polymerase chain reaction (RT-PCR). Flocks were classified into four groups acco...

Infectious bronchitis is a respiratory disease of chickens that is caused by the coronavirus infectious bronchitis virus (IBV). Virtually all broiler and layer breeder flocks are routinely vaccinated against IBV. Two hatches of 1-day-old chicks from four lines were mistakenly vaccinated for infectious bronchitis using a moderately attenuated vaccine designed for chicks of an older age. The vacc...

infectious bronchitis (ib) is an economically important disease of chickens. due to the emergence of new variants of infectious bronchitis virus (ibv), the control of ib has become a serious problem for the poultry industry worldwide. in the present study, the nucleocapsid gene (n) and 3' untranslated region (utr) of two ibvs isolated from iranian poultry farms were sequenced and compared with ...

Immunity against avian infectious bronchitis virus (IBV) was assessed in specific pathogen free (SPF) chickens vaccinated at age of three weeks with H120 attenuated vaccine strain and, after three weeks, by measuring the virus-neutralizing and viral specific antibody isotypes in the mucosa (lachrymal secretion) and systemic (serum) compartments, followed by the evaluation of the protection to c...

Infectious bronchitis (IB) is an economically important disease of chickens. Due to the emergence of new variants of infectious bronchitis virus (IBV), the control of IB has become a serious problem for the poultry industry worldwide. In the present study, the nucleocapsid gene (N) and 3' untranslated region (UTR) of two IBVs isolated from Iranian poultry farms were sequenced and compared with ...

The expression of infectious bronchitis virus (IBV) S1 glycoprotein in potatoes and its immunogenicity in mice and chickens were investigated. Potato plants were genetically transformed with a cDNA construct encoding the IBV S1 glycoprotein with the Agrobacterium system. Genomic DNA and mRNA analyses of the transformed plantlets confirmed the integration of the foreign cDNA into the potato geno...