this experimental study was carried out to induce a co-infection of h9 aiv and ibv with inoculumsprepared from tracheal scrubbed epithelium tissues in natural co-infected birds to rule out the effect of fieldundesired environmental conditions and also other infectious causative agents. eighty 1-day-old broilerswere randomly divided into four equal groups. at 21 days of age, three test groups we...

infectious bronchitis (ib) is a very contagious disease caused by a coronavirus (ibv). in chickens, thevirus affects the respiratory, reproductive, and urinary systems. this study was carried out to determine theseroprevalence of anti-ibv antibodies in domestic village chickens. serum samples of 300 domestic villagechickens from esfahan (centeral iran) were collected and examined for the presen...

the study was conducted to determine the type, frequency and severity of gross, histopathologic changes, effect of route of infection and also, tissue tropism of serotype 793/b (4/91) infectious bronchitis virus. 20 day-old specific pathogen free chicks were inoculated intra-tracheally and intra-orally with 793/b serotype and lesions studied histopathologically at interval up to 10 days post-in...

infectious bronchitis (ib) and newcastle disease (nd) are highly contagious and the most economically important diseases of the poultry affecting respiratory tract and causing economic losses in poultry industry throughout the world. in the present study, the simultaneous detection and differentiation of causative agents of these diseases were investigated using duplex-rt-pcr. rna was extracted...

background: avian infectious bronchitis (ib), with avianinfectious bronchitis virus (ibv) as the causing agent, is a ubiquitous endemicdisease of the chicken with devastating effects on its industry. a viralmembrane surface protein called s  notonly induces neutralizing antibodies but also plays an important role in virusbinding and entry to host cells. technically, s1 protein gene sequencing a...

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...