An atypical clinicopathological manifestation of fowlpox virus associated with reticuloendotheliosis virus in commercial laying hen flocks in Brazil

2020 ◽  
Vol 67 (6) ◽  
pp. 2923-2935
Author(s):  
Ruy D. Chacón ◽  
Claudete S. Astolfi‐Ferreira ◽  
David I. De la Torre ◽  
Lilian R. M. Sá ◽  
Antonio J. Piantino Ferreira
Keyword(s):  
Laying Hen ◽  
Reticuloendotheliosis Virus ◽  
Fowlpox Virus

scholarly journals Reticuloendotheliosis Virus Sequences within the Genomes of Field Strains of Fowlpox Virus Display Variability

2003 ◽  
Vol 77 (10) ◽  
pp. 5855-5862 ◽  
Author(s):  
Pratik Singh ◽  
William M. Schnitzlein ◽  
Deoki N. Tripathy
Keyword(s):  
Cultured Cells ◽  
The United States ◽  
Reticuloendotheliosis Virus ◽  
Long Terminal Repeats ◽  
Field Sample ◽  
Fowlpox Virus ◽  
Natural Event ◽  
Tracheal Lesion

ABSTRACT Nine field strains of fowlpox virus (FPV) isolated during a 24-year span from geographically diverse outbreaks of fowlpox in the United States were screened for the presence of reticuloendotheliosis virus (REV) sequences in their genomes by PCR. Each isolate appeared to be heterogeneous in that either a nearly intact provirus or just a 248- or 508-nucleotide fusion of portions of the integrated REV 5′ and 3′ long terminal repeats (LTRs) was exclusively present at the same genomic site. In contrast, four fowlpox vaccines of FPV origin and three originating from pigeonpox virus were genetically homogeneous in having retained only the 248-bp LTR fusion, whereas two other FPV-based vaccines had only the larger one. These remnants of integrated REV presumably arose during homologous recombination at one of the two regions common to both LTRs or during retroviral excision from the FPV genome. Loss of the provirus appeared to be a natural event because the tripartite population could be detected in a field sample (tracheal lesion). Moreover, the provirus was also readily deleted during propagation of FPV in cultured cells, as evidenced by the detection of truncated LTRs after one passage of a plaque-purified FPV recombinant having a “genetically marked” provirus. However, the deletion mutants did not appear to have a substantial replicative advantage in vitro because even after 55 serial passages the original recombinant FPV was still prevalent. As to the in vivo environment, retention of the REV provirus may confer some benefit to FPV for infection of poultry previously vaccinated against fowlpox.

scholarly journals Field and Vaccine Strains of Fowlpox Virus Carry Integrated Sequences from the Avian Retrovirus, Reticuloendotheliosis Virus

Virology ◽  
1997 ◽  
Vol 235 (2) ◽  
pp. 367-376 ◽  
Author(s):  
Christian Hertig ◽  
Barbara E.H. Coupar ◽  
Allan R. Gould ◽  
David B. Boyle
Keyword(s):  
Reticuloendotheliosis Virus ◽  
Fowlpox Virus

scholarly journals Detection of Fowlpox virus carrying distinct genome segments of Reticuloendotheliosis virus

2019 ◽  
Vol 260 ◽  
pp. 53-59 ◽  
Author(s):  
Lok R. Joshi ◽  
Fernando V. Bauermann ◽  
Kyle S. Hain ◽  
Gerald F. Kutish ◽  
Anibal G. Armién ◽  
...  
Keyword(s):  
Reticuloendotheliosis Virus ◽  
Fowlpox Virus

Characterisation of an Australian fowlpox virus carrying a near-full-length provirus of reticuloendotheliosis virus

2021 ◽  
Author(s):  
Subir Sarker ◽  
Ajani Athukorala ◽  
Timothy R. Bowden ◽  
David B. Boyle
Keyword(s):  
Full Length ◽  
Reticuloendotheliosis Virus ◽  
Fowlpox Virus

scholarly journals Mixed infection by fowlpox virus and Chlamydophila psittaci in a commercial laying hen flock

2014 ◽  
Vol 62 (1) ◽  
pp. 42-51 ◽  
Author(s):  
Teresa Karpińska ◽  
Wojciech Kozaczyński ◽  
Krzysztof Niemczuk ◽  
Agnieszka Jasik ◽  
Anna Kycko ◽  
...  
Keyword(s):  
Mixed Infection ◽  
Clinical Signs ◽  
Ultrastructural Level ◽  
Laying Hen ◽  
Ultrastructural Examination ◽  
Fowlpox Virus ◽  
Transmission Electron ◽  
Chlamydophila Psittaci ◽  
Clinical Consequences ◽  
Provinces Of Poland

An outbreak of fowlpox occurred in a commercial laying hen flock in one of the western provinces of Poland. Clinical signs suggested fowlpox and the diagnosis was confirmed by histopathological detection of Bollinger bodies within the epithelial cells. Detailed ultrastructural examination revealed an additional concurrent infection with chlamydia-like particles. The particles were identified by PCR as fowlpox virus andChlamydophila psittaci. It is worth noting that both pathogens can generate morphologic forms capable of prolonged survival and inducing latent and persistent infection. We suggest a possible interaction between the two pathogens on ultrastructural level and assess the clinical consequences of the mixed infection. This study also demonstrates a potential of the transmission electron microscope (TEM) for identifying a superinfection with another pathogen (in this caseC. psittaci), which may remain undetected by routine techniques.

Existence of variant strains Fowlpox virus integrated with Reticuloendotheliosis virus in its genome in field isolates in Tanzania

2014 ◽  
Vol 46 (5) ◽  
pp. 711-716 ◽  
Author(s):  
Alexanda Mzula ◽  
Selemani N. Masola ◽  
Christopher J. Kasanga ◽  
Philemon N. Wambura
Keyword(s):  
Reticuloendotheliosis Virus ◽  
Fowlpox Virus ◽  
Field Isolates

scholarly journals Field isolates of fowlpox virus contaminated with reticuloendotheliosis virus

1998 ◽  
Vol 27 (1) ◽  
pp. 60-66 ◽  
Author(s):  
I. S. Diallo ◽  
M. A. MacKenzie ◽  
P. B. Spradbrow ◽  
W. F. Robinson
Keyword(s):  
Reticuloendotheliosis Virus ◽  
Fowlpox Virus ◽  
Field Isolates
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