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High Prevalence of Turkey Parvovirus in Turkey Flocks from Hungary Experiencing Enteric Disease Syndromes

Author:
Palade, Elena Alina, Demeter, Zoltán, Hornyák, Ákos, Nemes, Csaba, Kisary, János, Rusvai, Miklós
Source:
Avian diseases 2011 v.55 no.3 pp. 468-475
ISSN:
0005-2086
Subject:
Avastrovirus 3, Coronavirinae, Galliform aveparvovirus 1, Protoparvovirus, Rotavirus, bird diseases, environmental factors, epidemiology, flocks, genes, mortality, pathogens, phylogeny, restriction fragment length polymorphism, reverse transcriptase polymerase chain reaction, turkeys, viruses, Hungary
Abstract:
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%. The investigations directly demonstrated the high prevalence of turkey parvovirus (TuPV) in 23 flocks (46.9%) experiencing signs of ED, making this pathogen the second most identified after astroviruses. Phylogenetic analysis on a 527 base pair-long region from the NS1 gene revealed two main clusters, a chicken parvovirus (ChPV) and a TuPV group, but also the presence of a divergent branch of tentatively named :"TuPV-like ChPV" strains. The 23 Hungarian TuPV strains were separately positioned in two groups from the American origin sequences in the TuPV cluster. An AvaII-based restriction fragment length polymorphism assay has also been developed for the quick differentiation of TuPV, ChPV, and divergent TuPV-like ChPV strains. As most detected enteric viruses have been directly demonstrated in healthy turkey flocks as well, the epidemiology of this disease complex remains unclear, suggesting that a certain combination of pathogens, environmental factors, or both are necessary for the development of clinical signs.
Agid:
303616