background: infectious bronchitis virus (ibv) is the causative agent of avian infectious bronchitis, which is characterized by respiratory, reproductive, and renal signs. ibv is a highly variable virus with a large number of genotypes. s1 gene sequencing has been used for molecular epidemiological studies and genotypic characterization of ibv. objective: to better understand the molecular epide...

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...

in order to identify predominant circulating types of infectious bronchitis(ib) virus in the period of 1999-2004 in iran, samples(trachea, lung, kidney) from 150 various flocks showing respiratory signs suspected to be related to ib infection were inoculated to spf eggs. then allantoic fluids studied by rt-pcr and nested pcr using group and type specific primers to probing massachusset, 793/b a...

avian infectious bronchitis (ib) is a major cause of economic losses in poultry industry. the ib virus primarily affects respiratory tract, but various strains differ in their tropism for other target organs such as kidney and alimentary tract. the objective of this study was to estimate the pathogenicity of iranian ibv variant (ir-1), which is limited exclusively to iran. specific pathogen fre...

avian infectious bronchitis (ib), caused by a gammacoronavirus, is an oie-listed (list b) disease and characterized by respiratory and renal involvements, causing high mortality, and economic loss in both layers and broilers. in comparison with other diagnostic methods, real-time polymerase chain reaction (rt-pcr) and conventional rt-pcr are potent, more sensitive and faster techniques for infe...

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...

infectious bronchitis virus (ibv) belongs to the group of gamma coronaviruses along with other avian coronaviruses. the disease caused by ibv can appear similar to infectious laryngotracheitis, avian influenza, and velogenic newcastle disease, which are high priority diseases. the clinical signs can be accompanied by mortalities in broiler chickens and reduced eggshell and albumin quality in la...

increased susceptibility of birds to avian pathogens in intensive husbandry system has emphasized on necessity of improvement of innate and specific immune responses of birds by the fast establishment of a beneficial microflora and immune stimulator factors to guarantee healthy and low-price products. during this study, 192 one-day-old broiler chicks (ross-380) in four groups with three replica...

280 Characterization of infectious bronchitis virus isolates from backyard flocks. AAAP abstract † 281 Recombination in avian gamma-coronavirus infectious bronchitis virus (IBV). 282 Evaluation of possible interference between Arkansas and Massachusetts vaccine serotypes. AAAP abstract † 283 Interactions between multivalent attenuated live infectious bronchitis virus (IBV) vaccines in one-day-o...