| detection and molecular characterization of astroviruses in turkeys. | this study was conducted to determine the prevalence and molecular characteristics of turkey astrovirus 1 (tastv-1) and avian nephritis virus (anv) in turkeys with light turkey syndrome (lts), which is characterized by lower body weight in market-age turkeys than their standard breed character. we collected pools of fecal samples from four lts and two non-lts turkey flocks in minnesota at 2, 3, 5 and 8 weeks of age. of the 80 lts pools tested, 16 (20.0 %) and 11 (13.8 %) were positive for tastv- ... | 2016 | 26780891 |
| astroviruses associated with stunting and pre-hatching mortality in duck and goose embryos. | the first detection of avian nephritis virus (anv) in goose embryos and of turkey astrovirus-1 (tastv-1) in duck embryos is described. intestinal samples from duck and goose embryos from five duck and four goose flocks in croatia were tested by polymerase chain reaction for the presence of anv, tastv-1, turkey astrovirus-2, chicken astrovirus, duck astrovirus and also for the presence of avian reovirus, derzsy's disease virus and duck enteritis virus. the kidneys from duck and goose embryos were ... | 2012 | 22845326 |
| enteric viruses detected by molecular methods in commercial chicken and turkey flocks in the united states between 2005 and 2006. | intestinal samples collected from 43 commercial broiler and 33 commercial turkey flocks from all regions of the united states during 2005 and 2006 were examined for the presence of astrovirus, rotavirus, reovirus, and coronavirus by reverse transcription-polymerase chain reaction (pcr), and for the presence of groups 1 and 2 adenovirus by pcr. phylogenetic analysis was performed to further characterize the viruses and to evaluate species association and geographic patterns. astroviruses were ide ... | 2008 | 18646452 |
| a multiplex rt-pcr test for the differential identification of turkey astrovirus type 1, turkey astrovirus type 2, chicken astrovirus, avian nephritis virus, and avian rotavirus. | recent studies have revealed the presence ofastroviruses and rotavirus in numerous poorly performing and healthy chicken and turkey flocks in the united states. the phylogenetic analysis of the sequence data produced during these studies has identified four groups of avian astroviruses circulating in the united states: turkey astrovirus types 1 and 2 (tastv-1 and tastv-2), avian nephritis virus (anv), and a chicken-origin astrovirus (castv). as the molecular epidemiology of poultry enteric disea ... | 2007 | 17992926 |
| molecular characterization and typing of chicken and turkey astroviruses circulating in the united states: implications for diagnostics. | avian astroviruses were detected by reverse transcriptase and polymerase chain reaction in intestinal contents collected from commercial chickens and turkeys from throughout the united states from 2003 through 2005. astroviruses were detected in birds from both healthy and poorly performing flocks with or without enteric disease. phylogenetic analysis was performed with sequence data from the polymerase (orf-1b) genes of 41 turkey-origin astroviruses and 23 chicken-origin astroviruses. all curre ... | 2006 | 17039840 |
| the isolation and characterisation of astroviruses from chickens. | the isolation, cultivation and characterization of three chicken astroviruses (castv) isolates are described. they are antigenically related to each other but unrelated to avian nephritis virus (anv) and duck hepatitis virus type 2 (dvh2) in neutralization, immunofluorescence and gel diffusion tests. castv, anv and dvh2 all grew well in the lmh cell line, which was used for assay and serological tests. serological surveys in 1982 and 2001 showed that antibody to castv virus was widespread in bro ... | 2004 | 15223568 |
| avian astroviruses. | as poultry becomes more important in the world economy, it is increasingly important to fully understand the mechanisms of disease and poor production that affect the industry. to more accurately and reasonably treat these diseases, a more sophisticated understanding of interrelatedness is required. this review focuses on avian astroviruses (aastvs), in particular the recent advances in our understanding of aastv molecular biology, and also history, diagnosis, treatment and control. the known aa ... | 2002 | 12396344 |
| turkey astrovirus type 1 (tastv-1) and chicken astrovirus (castv) detection in brazilian chicken flocks. | astrovirus is a common cause of enteritis in humans and domestic animals. here we report the detection of turkey astrovirus type 1 (tastv-1) and chicken astrovirus (castv) in avian farms. sixty fecal sample pools (five or six birds of the same flock), from chickens without apparent clinical symptoms of enteric disease from farms located in six brazilian states, were screened by an orf1b pcr, followed by nucleotide sequencing of amplified products and phylogenetic analysis. six samples tested pos ... | 2016 | 27610731 |
| co-circulation of distinct genetic lineages of astroviruses in turkeys and guinea fowl. | viruses belonging to the genus astrovirus have been increasingly associated with enteritis in mammalian and avian species, including turkeys. more recently, astroviruses have also been detected in diseased guinea fowl. in turkeys, two genetically distinct types of astrovirus have been reported, namely turkey astrovirus 1 and 2 (tastv1 and tastv2). the prevalence and the pathogenesis of astrovirus infections in this species is currently unknown, with the exception of data generated in the usa. in ... | 2007 | 17106624 |