Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)

Olivia Murray,1 Debra Turner,1 Kristen Streeter,1 Jianhua Guo,1 HL Shivaprasad,2 Susan Payne,1 Ian Tizard1 1Schubot Exotic Bird Health Center, Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, Co...

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Autores principales:	Murray O, Turner D, Streeter K, Guo J, Shivaprasad HL, Payne S, Tizard I
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2017
Materias:	Cockatiel Immunohistochemistry Bornavirus Polymerase chain reaction Proventricular dilatation disease. Veterinary medicine SF600-1100
Acceso en línea:	https://doaj.org/article/e085f93f5eb14c3cac284fb537535695
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spelling	oai:doaj.org-article:e085f93f5eb14c3cac284fb5375356952021-12-02T08:17:18ZApparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)2230-2034https://doaj.org/article/e085f93f5eb14c3cac284fb5375356952017-07-01T00:00:00Zhttps://www.dovepress.com/apparent-resolution-of-parrot-bornavirus-infection-in-cockatiels-nymph-peer-reviewed-article-VMRRhttps://doaj.org/toc/2230-2034Olivia Murray,1 Debra Turner,1 Kristen Streeter,1 Jianhua Guo,1 HL Shivaprasad,2 Susan Payne,1 Ian Tizard1 1Schubot Exotic Bird Health Center, Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX, 2California Animal Health and Food Safety Laboratory System, University of California, Tulare, CA, USA Abstract: Parrot bornavirus (PaBV), the etiologic agent of proventricular dilatation disease (PDD), is a major cause of concern in the avian health community. Within an infected flock, some birds will develop PDD and succumb to disease, while others remain healthy. Until now, there has been no study describing the results of long-term infection in apparently healthy carriers. For the last 5 years, the Schubot Exotic Bird Health Center at Texas A&M University has monitored individual PaBV shedding data in a flock of 66 naturally infected cockatiels. Of these birds, 53 were detected shedding PaBV4 in their droppings by reverse transcriptase polymerase chain reaction on at least one occasion. However, the prevalence of shedding declined over time, with the last positive cloacal swab being in October 2013. To determine whether the decline and eventual lack of shedding was an indication of virus elimination, seven previously shedding birds were euthanized and necropsied in 2016. Neither any gross lesion of PDD was observed nor was there any evidence of PDD or bornaviral encephalitis detected by histopathology. All tissues tested were negative for the presence of PaBV by reverse transcriptase polymerase chain reaction and immunohistochemistry. Thus, there was no evidence of an ongoing, productive infection in these birds. There are two possible explanations for these results. One possibility is that the birds were previously infected and have subsequently eliminated the virus. Alternatively, there may have been as few as three truly infected birds in the flock and the transient detection of PaBV in the droppings of other birds may simply be a “pass-through” phenomenon. Keywords: cockatiel, immunohistochemistry, parrot bornavirus, polymerase chain reaction, proventricular dilatation diseaseMurray OTurner DStreeter KGuo JShivaprasad HLPayne STizard IDove Medical PressarticleCockatielImmunohistochemistryBornavirusPolymerase chain reactionProventricular dilatation disease.Veterinary medicineSF600-1100ENVeterinary Medicine: Research and Reports, Vol Volume 8, Pp 31-36 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Cockatiel Immunohistochemistry Bornavirus Polymerase chain reaction Proventricular dilatation disease. Veterinary medicine SF600-1100
spellingShingle	Cockatiel Immunohistochemistry Bornavirus Polymerase chain reaction Proventricular dilatation disease. Veterinary medicine SF600-1100 Murray O Turner D Streeter K Guo J Shivaprasad HL Payne S Tizard I Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)
description	Olivia Murray,1 Debra Turner,1 Kristen Streeter,1 Jianhua Guo,1 HL Shivaprasad,2 Susan Payne,1 Ian Tizard1 1Schubot Exotic Bird Health Center, Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX, 2California Animal Health and Food Safety Laboratory System, University of California, Tulare, CA, USA Abstract: Parrot bornavirus (PaBV), the etiologic agent of proventricular dilatation disease (PDD), is a major cause of concern in the avian health community. Within an infected flock, some birds will develop PDD and succumb to disease, while others remain healthy. Until now, there has been no study describing the results of long-term infection in apparently healthy carriers. For the last 5 years, the Schubot Exotic Bird Health Center at Texas A&M University has monitored individual PaBV shedding data in a flock of 66 naturally infected cockatiels. Of these birds, 53 were detected shedding PaBV4 in their droppings by reverse transcriptase polymerase chain reaction on at least one occasion. However, the prevalence of shedding declined over time, with the last positive cloacal swab being in October 2013. To determine whether the decline and eventual lack of shedding was an indication of virus elimination, seven previously shedding birds were euthanized and necropsied in 2016. Neither any gross lesion of PDD was observed nor was there any evidence of PDD or bornaviral encephalitis detected by histopathology. All tissues tested were negative for the presence of PaBV by reverse transcriptase polymerase chain reaction and immunohistochemistry. Thus, there was no evidence of an ongoing, productive infection in these birds. There are two possible explanations for these results. One possibility is that the birds were previously infected and have subsequently eliminated the virus. Alternatively, there may have been as few as three truly infected birds in the flock and the transient detection of PaBV in the droppings of other birds may simply be a “pass-through” phenomenon. Keywords: cockatiel, immunohistochemistry, parrot bornavirus, polymerase chain reaction, proventricular dilatation disease
format	article
author	Murray O Turner D Streeter K Guo J Shivaprasad HL Payne S Tizard I
author_facet	Murray O Turner D Streeter K Guo J Shivaprasad HL Payne S Tizard I
author_sort	Murray O
title	Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)
title_short	Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)
title_full	Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)
title_fullStr	Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)
title_full_unstemmed	Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)
title_sort	apparent resolution of parrot bornavirus infection in cockatiels (nymphicus hollandicus)
publisher	Dove Medical Press
publishDate	2017
url	https://doaj.org/article/e085f93f5eb14c3cac284fb537535695
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_version_	1718398632856649728

Apparent resolution of parrot bornavirus infection in cockatiels (Nymphicus hollandicus)

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