avian 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 ...200212396344
pathogenicity of turkey coronavirus in turkeys and chickens.we designed this study to compare the replication potential of turkey coronavirus (tcv) and its effect in chickens and turkeys and to study the effect of singleand combined infection of turkey poults with tcv and astrovirus. we studied the pathogenicity of tcv in experimentally inoculated turkey poults and chickens by observing the dinical signs and gross lesions. two trials were conducted with 1-day-old and 4-wk-old specific-pathogen-free turkey poults and chickens. one-day-old turkey poults de ...200314562877
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 ...200415223568
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 ...200717992926
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 ...200818646452
molecular characterization of a duck hepatitis virus 3-like astrovirus.using an orf1b-based astrovirus-specific reverse transcription (rt)-pcr assay, a duck hepatitis virus type 3 (dhv-3)-like astrovirus was detected from four intestinal samples collected from diseased ducks in china. complete genome sequencing and comparative sequence analysis showed that the four duck astrovirus (dastv) isolates were closely related and possessed a typical astrovirus genome organization. genetic analysis of the complete orf2 region revealed that mean amino acid genetic distances ...201424560589
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- ...201626780891
age-related susceptibility of turkeys to enteric viruses.several different enteric viruses have been identified as the causes of gastrointestinal infections in poultry. enteric virus infections are well characterized in poults, but limited studies have been conducted in older birds. the susceptibility of 2-, 7-, 12-, 30-, and 52-wk-old turkeys to turkey coronavirus (tcov) and turkey astrovirus (tastv) was evaluated, as well as the effect of combined infection of tastv and tcov in 2-wk-old poults and turkey hens. from cloacal swabs and intestines, tcov ...201526473670
circulation and phylogenetic relationship of chicken and turkey-origin astroviruses detected in domestic ducks (anas platyrhynchos domesticus).the natural occurrence of chicken and turkey-origin astroviruses in domestic ducks (anas platyrhynchos domesticus) is described. twenty-two duck flocks were covered by this research. the liver, spleen, kidney and intestines were sampled and tested by reverse-transcription polymerase chain reaction for the presence of avian nephritis virus (anv), chicken astrovirus (castv), turkey astrovirus (tastv)-1, tastv-2 and duck astrovirus. the astrovirus infection was confirmed in multiple organ samples f ...201223237368
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 ...201627610731
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 ...201222845326
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 ...200617039840
high prevalence of turkey parvovirus in turkey flocks from hungary experiencing enteric disease syndromes.samples collected in 2008 and 2009, from 49 turkey flocks of 6 to 43 days in age and presenting clinical signs of enteric disease and high mortality, were tested by polymerase chain reaction and reverse transcription-polymerase chain reaction for the presence of viruses currently associated with enteric disease (ed) syndromes: astrovirus, reovirus, rotavirus, coronavirus, adenovirus, and parvovirus. turkey astroviruses were found in 83.67% of the cases and turkey astrovirus 2 (tast-2) in 26.53%. ...201122017049
identification of chicken enterovirus-like viruses, duck hepatitis virus type 2 and duck hepatitis virus type 3 as astroviruses.earlier work identified and biologically characterized antigenically distinct enterovirus-like viruses (elvs) of chickens. three of these elvs can now be identified as astroviruses. characterization involved the use of a hitherto undescribed, degenerate primer-based reverse transcription-polymerase chain reaction (rt-pcr) to amplify astrovirus open reading frame (orf) 1b-specific cdna fragments followed by nucleotide sequence determination and analysis of the amplified fragments. elv-1 was confi ...200919156577
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