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...

background: the h9n2 subtype of avian influenzaviruses (aivs) has been isolated in multiple avian species inmany european, asian, african and american countries. sincethe first outbreak of h9n2 virus in iran in 1998, this virus haswidely circulated throughout the country, resulting in majoreconomic losses in chicken flocks. several amino acids in thevirus ribonucleoprotein (rnp) complex includi...

avian influenza is one of the most important diseases in avian industry, which also threats human population. thus, vaccination is necessary for controlling this viral disease. in this study, killed vaccine of avian influenza subtype h9n2 and formalin solution (for virus inactivation) were used. it is necessary to study the effect of different factors such as formalin concentration, as well as ...

most highly pathogenic avian influenza viruses (aiv) emerge after field passage of non-pathogenic aivs in birds. the outbreak of low-pathogenic h7n1 avian influenza virus in italy during 1999-2000 followed by outbreak of highly pathogenic h7n1 avian influenza virus is one example in this regard. this experiment has been designed to investigate the effect of pre-infection of birds with lpai on s...

although migratory waterfowl is well known to be a major reservoir for avian influenza virus (aiv), there are only few recently published reports about the seroprevalence of aiv in this group of birds. to investigate the aiv antibody status in migratory waterfowl of iran, we collected 217 serum samples from 25 different species of waterfowl during 2003 and 2004. these serum samples were tested ...

influenza is a contagious viral disease that is seen in avian, human and other mammals, so its control is important. vaccination against influenza virus subtype h9n2 is one of the ways in controlling program, for this reason several vaccines has been produced. recently, application of inactivated oil-emulsion vaccines in poultry for controlling low pathogenic avian influenza is increasing. at p...

Avian influenza H9N2 subtype viruses have had a great impact on Iranian industrial poultry production economy since introduction in the country. To approach Rapid and precise identification of this viruses as control measures in poultry industry, a real time probe base assay was developed to directly detect a specific influenza virus of H9N2 subtype -instead of general detection of Influenza A ...

human infection with avian influenza a h7n9 virus has emerged in china with high morbidity rates. patients usually present with severe and rapidly progressive pneumonia. therefore, radiological findings are important to diagnose and evaluate disease severity. the clinical characteristics of three new cases of h7n9 virus infection were analyzed, especially the radiological findings, and previous...

A reassortant influenza A virus was produced by mating an avian influenza A/Pintail/Alberta/119/79 (H4N6) virus with wild-type human influenza A/Washington/897/80 (H3N2) virus. The avian-human influenza A reassortant virus contained the genes coding for the hemagglutinin and neuraminidase surface antigens of the human influenza wild-type virus and the six other RNA segments (internal genes) of ...