Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Microbiology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300861 |
Resumo: | Newcastle disease vaccines hitherto in vogue are produced from embryonated chicken eggs. Egg-adapted mesogenic vaccines possess several drawbacks such as paralysis and mortality in 2-week-old chicks and reduced egg production in the egg-laying flock. Owing to these possible drawbacks, we attempted to reduce the vaccine virulence for safe vaccination by adapting the virus in a chicken embryo fibroblast cell culture (CEFCC) system. Eighteen passages were carried out by CEFCC, and the pathogenicity was assessed on the basis of the mean death time, intracerebral pathogenicity index, and intravenous pathogenicity index, at equal passage intervals. Although the reduction in virulence demonstrated with increasing passage levels in CEFCC was encouraging, 20% of the 2-week-old birds showed paralytic symptoms with the virus vaccine from the 18th(final) passage. Thus, a tissue-culture-adapted vaccine would demand a few more passages by CEFCC in order to achieve a complete reduction in virulence for use as a safe and effective vaccine, especially among younger chicks. Moreover, it can be safely administered even to unprimed 8-week-old birds. |
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Brazilian Journal of Microbiology |
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Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain KomarovNewcastle diseaseKomarov strainchicken embryo fibroblastNewcastle disease vaccineNewcastle disease vaccines hitherto in vogue are produced from embryonated chicken eggs. Egg-adapted mesogenic vaccines possess several drawbacks such as paralysis and mortality in 2-week-old chicks and reduced egg production in the egg-laying flock. Owing to these possible drawbacks, we attempted to reduce the vaccine virulence for safe vaccination by adapting the virus in a chicken embryo fibroblast cell culture (CEFCC) system. Eighteen passages were carried out by CEFCC, and the pathogenicity was assessed on the basis of the mean death time, intracerebral pathogenicity index, and intravenous pathogenicity index, at equal passage intervals. Although the reduction in virulence demonstrated with increasing passage levels in CEFCC was encouraging, 20% of the 2-week-old birds showed paralytic symptoms with the virus vaccine from the 18th(final) passage. Thus, a tissue-culture-adapted vaccine would demand a few more passages by CEFCC in order to achieve a complete reduction in virulence for use as a safe and effective vaccine, especially among younger chicks. Moreover, it can be safely administered even to unprimed 8-week-old birds.Sociedade Brasileira de Microbiologia2015-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300861Brazilian Journal of Microbiology v.46 n.3 2015reponame:Brazilian Journal of Microbiologyinstname:Sociedade Brasileira de Microbiologia (SBM)instacron:SBM10.1590/S1517-838246320140051info:eu-repo/semantics/openAccessVisnuvinayagam,SivamK,ThangavelN,LalithaS,MalmaruganSukumar,Kuppannaneng2015-08-31T00:00:00Zoai:scielo:S1517-83822015000300861Revistahttps://www.scielo.br/j/bjm/ONGhttps://old.scielo.br/oai/scielo-oai.phpbjm@sbmicrobiologia.org.br||mbmartin@usp.br1678-44051517-8382opendoar:2015-08-31T00:00Brazilian Journal of Microbiology - Sociedade Brasileira de Microbiologia (SBM)false |
dc.title.none.fl_str_mv |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
title |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
spellingShingle |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov Visnuvinayagam,Sivam Newcastle disease Komarov strain chicken embryo fibroblast Newcastle disease vaccine |
title_short |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
title_full |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
title_fullStr |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
title_full_unstemmed |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
title_sort |
Assessment of the pathogenicity of cell-culture-adapted Newcastle disease virus strain Komarov |
author |
Visnuvinayagam,Sivam |
author_facet |
Visnuvinayagam,Sivam K,Thangavel N,Lalitha S,Malmarugan Sukumar,Kuppannan |
author_role |
author |
author2 |
K,Thangavel N,Lalitha S,Malmarugan Sukumar,Kuppannan |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Visnuvinayagam,Sivam K,Thangavel N,Lalitha S,Malmarugan Sukumar,Kuppannan |
dc.subject.por.fl_str_mv |
Newcastle disease Komarov strain chicken embryo fibroblast Newcastle disease vaccine |
topic |
Newcastle disease Komarov strain chicken embryo fibroblast Newcastle disease vaccine |
description |
Newcastle disease vaccines hitherto in vogue are produced from embryonated chicken eggs. Egg-adapted mesogenic vaccines possess several drawbacks such as paralysis and mortality in 2-week-old chicks and reduced egg production in the egg-laying flock. Owing to these possible drawbacks, we attempted to reduce the vaccine virulence for safe vaccination by adapting the virus in a chicken embryo fibroblast cell culture (CEFCC) system. Eighteen passages were carried out by CEFCC, and the pathogenicity was assessed on the basis of the mean death time, intracerebral pathogenicity index, and intravenous pathogenicity index, at equal passage intervals. Although the reduction in virulence demonstrated with increasing passage levels in CEFCC was encouraging, 20% of the 2-week-old birds showed paralytic symptoms with the virus vaccine from the 18th(final) passage. Thus, a tissue-culture-adapted vaccine would demand a few more passages by CEFCC in order to achieve a complete reduction in virulence for use as a safe and effective vaccine, especially among younger chicks. Moreover, it can be safely administered even to unprimed 8-week-old birds. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-09-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300861 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300861 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1517-838246320140051 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Microbiologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Microbiologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Microbiology v.46 n.3 2015 reponame:Brazilian Journal of Microbiology instname:Sociedade Brasileira de Microbiologia (SBM) instacron:SBM |
instname_str |
Sociedade Brasileira de Microbiologia (SBM) |
instacron_str |
SBM |
institution |
SBM |
reponame_str |
Brazilian Journal of Microbiology |
collection |
Brazilian Journal of Microbiology |
repository.name.fl_str_mv |
Brazilian Journal of Microbiology - Sociedade Brasileira de Microbiologia (SBM) |
repository.mail.fl_str_mv |
bjm@sbmicrobiologia.org.br||mbmartin@usp.br |
_version_ |
1752122207929106432 |