Comparative pathogenicity of bovine herpesvirus 1 (BHV-1) subtypes 1 (BHV-1.1) and 2a (BHV-1.2a)

O presente estudo teve como objetivo examinar a capacidade de duas amostras de herpesvírus bovino tipo 1 (BHV-1) de diferentes subtipos (amostra EVI 123/96: BHV-1.1; amostra SV265/98: BHV-1.2a) de induzir doença respiratória em bovinos. Estas duas amostras são representativas de subtipos de BHV-1 pr...

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Published in:Pesquisa veterinária brasileira Vol. 24; no. 1; pp. 43 - 49
Main Authors: Spilki, F.R, Esteves, P.A, Lima, M. de, Franco, A.C, Chiminazzo, C, Flores, E.F, Weiblen, R, Driemeier, D, Roehe, P.M
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Published: Colégio Brasileiro de Patologia Animal - CBPA 01-01-2004
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Abstract O presente estudo teve como objetivo examinar a capacidade de duas amostras de herpesvírus bovino tipo 1 (BHV-1) de diferentes subtipos (amostra EVI 123/96: BHV-1.1; amostra SV265/98: BHV-1.2a) de induzir doença respiratória em bovinos. Estas duas amostras são representativas de subtipos de BHV-1 prevalentes no Brasil. Os subtipos das amostras foram confirmados por análises com anticorpos monoclonais e com enzimas de restrição. As amostras foram inoculadas por via intranasal em sete bezerros de três meses de idade (quatro com BHV-1.1, três com BHV-1.2a), soronegativos para BHV-1, sendo outros três animais mantidos como controles não infectados. Nos dois grupos de animais inoculados, os sinais clínicos observados foram consistentes com o quadro de rinotraqueíte infecciosa bovina (IBR), incluindo febre, apatia, anorexia, descargas mucopurulentas nasais e oculares, conjuntivite, erosões e hiperemia na mucosa nasal, dispnéia, tosse, estridor traqueal e aumento dos linfonodos retrofaríngeos, submandibulares e cervicais. Não foram observadas diferenças significativas entre os escores clínicos atribuídos aos animais nos dois grupos. Igualmente, foram similares as quantidades de vírus re-isoladas dos animais infectados, à exceção de uma diferença significativa na disseminação de vírus pelas secreções nasais, a qual foi maior nos animais infectados com BHV-1.1 nos dias 1 a 3 pós-inoculação. Após reativação induzida por corticosteróides, foi observado recrudescimento dos sinais clínicos, os quais foram também similares em ambos os grupos. Em conclusão, as amostras de BHV-1 dos subtipos 1 e 2a não apresentaram diferenças significativas em sua patogenicidade sobre o trato respiratório nos animais inoculados, tanto após a infecção primária como após a reativação. The study aimed to examine the capacity of two bovine herpesvirus type 1 (BHV-1) isolates of different subtypes (EVI 123/96, BHV-1.1; SV265/98, BHV-1.2a) to induce respiratory disease in calves. These two isolates are representative of the BHV-1 subtypes prevalent in Brazil. Viral subtypes were confirmed by monoclonal antibody analysis and by restriction enzyme digestion of viral genomes. The viruses were inoculated intranasally into seven 3 months old calves (four with BHV-1.1, three with BHV-1.2a). Three other calves of identical age and condition were kept as uninfected controls. In both groups of infected calves, the clinical signs observed were consistent with typical infectious bovine rhinothracheitis (IBR), including pyrexia, apathy, anorexia, nasal and ocular mucopurulent discharges, erosions on the nasal mucosa, conjunctivitis, lachrymation, redness of nasal mucosa, dyspnoea, coughing, tracheal stridor and enlargement of retropharingeal, submandibular and cervical lymphnodes. No significant differences were observed between the clinical scores attributed to both groups. Virus shedding in nasal and ocular secretions were also similar, apart from a significant difference in nasal virus shedding on day 1 to 3 post-inoculation, which was higher for BHV-1.1 than for BHV-1.2a. Following corticosteroid induced reactivation of the latent infection, recrudescence of clinical signs was also observed, with no significant differences on both groups. It was concluded that both subtypes BHV-1.1 and BHV-1.2a were able to induce clinically undistinguishable respiratory disease in calves, either subsequent to a primary infection or following reactivation.
AbstractList The study aimed to examine the capacity of two bovine herpesvirus type 1 (BHV-1) isolates of different subtypes (EVI 123/96, BHV-1.1; SV265/98, BHV-1.2a) to induce respiratory disease in calves. These two isolates are representative of the BHV-1 subtypes prevalent in Brazil. Viral subtypes were confirmed by monoclonal antibody analysis and by restriction enzyme digestion of viral genomes. The viruses were inoculated intranasally into seven 3 months old calves (four with BHV-1.1, three with BHV-1.2a). Three other calves of identical age and condition were kept as uninfected controls. In both groups of infected calves, the clinical signs observed were consistent with typical infectious bovine rhinothracheitis (IBR), including pyrexia, apathy, anorexia, nasal and ocular mucopurulent discharges, erosions on the nasal mucosa, conjunctivitis, lachrymation, redness of nasal mucosa, dyspnoea, coughing, tracheal stridor and enlargement of retropharingeal, submandibular and cervical lymphnodes. No significant differences were observed between the clinical scores attributed to both groups. Virus shedding in nasal and ocular secretions were also similar, apart from a significant difference in nasal virus shedding on day 1 to 3 post-inoculation, which was higher for BHV-1.1 than for BHV-1.2a. Following corticosteroid induced reactivation of the latent infection, recrudescence of clinical signs was also observed, with no significant differences on both groups. It was concluded that both subtypes BHV-1.1 and BHV-1.2a were able to induce clinically undistinguishable respiratory disease in calves, either subsequent to a primary infection or following reactivation. O presente estudo teve como objetivo examinar a capacidade de duas amostras de herpesvírus bovino tipo 1 (BHV-1) de diferentes subtipos (amostra EVI 123/96: BHV-1.1; amostra SV265/98: BHV-1.2a) de induzir doença respiratória em bovinos. Estas duas amostras são representativas de subtipos de BHV-1 prevalentes no Brasil. Os subtipos das amostras foram confirmados por análises com anticorpos monoclonais e com enzimas de restrição. As amostras foram inoculadas por via intranasal em sete bezerros de três meses de idade (quatro com BHV-1.1, três com BHV-1.2a), soronegativos para BHV-1, sendo outros três animais mantidos como controles não infectados. Nos dois grupos de animais inoculados, os sinais clínicos observados foram consistentes com o quadro de rinotraqueíte infecciosa bovina (IBR), incluindo febre, apatia, anorexia, descargas mucopurulentas nasais e oculares, conjuntivite, erosões e hiperemia na mucosa nasal, dispnéia, tosse, estridor traqueal e aumento dos linfonodos retrofaríngeos, submandibulares e cervicais. Não foram observadas diferenças significativas entre os escores clínicos atribuídos aos animais nos dois grupos. Igualmente, foram similares as quantidades de vírus re-isoladas dos animais infectados, à exceção de uma diferença significativa na disseminação de vírus pelas secreções nasais, a qual foi maior nos animais infectados com BHV-1.1 nos dias 1 a 3 pós-inoculação. Após reativação induzida por corticosteróides, foi observado recrudescimento dos sinais clínicos, os quais foram também similares em ambos os grupos. Em conclusão, as amostras de BHV-1 dos subtipos 1 e 2a não apresentaram diferenças significativas em sua patogenicidade sobre o trato respiratório nos animais inoculados, tanto após a infecção primária como após a reativação.
O presente estudo teve como objetivo examinar a capacidade de duas amostras de herpesvírus bovino tipo 1 (BHV-1) de diferentes subtipos (amostra EVI 123/96: BHV-1.1; amostra SV265/98: BHV-1.2a) de induzir doença respiratória em bovinos. Estas duas amostras são representativas de subtipos de BHV-1 prevalentes no Brasil. Os subtipos das amostras foram confirmados por análises com anticorpos monoclonais e com enzimas de restrição. As amostras foram inoculadas por via intranasal em sete bezerros de três meses de idade (quatro com BHV-1.1, três com BHV-1.2a), soronegativos para BHV-1, sendo outros três animais mantidos como controles não infectados. Nos dois grupos de animais inoculados, os sinais clínicos observados foram consistentes com o quadro de rinotraqueíte infecciosa bovina (IBR), incluindo febre, apatia, anorexia, descargas mucopurulentas nasais e oculares, conjuntivite, erosões e hiperemia na mucosa nasal, dispnéia, tosse, estridor traqueal e aumento dos linfonodos retrofaríngeos, submandibulares e cervicais. Não foram observadas diferenças significativas entre os escores clínicos atribuídos aos animais nos dois grupos. Igualmente, foram similares as quantidades de vírus re-isoladas dos animais infectados, à exceção de uma diferença significativa na disseminação de vírus pelas secreções nasais, a qual foi maior nos animais infectados com BHV-1.1 nos dias 1 a 3 pós-inoculação. Após reativação induzida por corticosteróides, foi observado recrudescimento dos sinais clínicos, os quais foram também similares em ambos os grupos. Em conclusão, as amostras de BHV-1 dos subtipos 1 e 2a não apresentaram diferenças significativas em sua patogenicidade sobre o trato respiratório nos animais inoculados, tanto após a infecção primária como após a reativação. The study aimed to examine the capacity of two bovine herpesvirus type 1 (BHV-1) isolates of different subtypes (EVI 123/96, BHV-1.1; SV265/98, BHV-1.2a) to induce respiratory disease in calves. These two isolates are representative of the BHV-1 subtypes prevalent in Brazil. Viral subtypes were confirmed by monoclonal antibody analysis and by restriction enzyme digestion of viral genomes. The viruses were inoculated intranasally into seven 3 months old calves (four with BHV-1.1, three with BHV-1.2a). Three other calves of identical age and condition were kept as uninfected controls. In both groups of infected calves, the clinical signs observed were consistent with typical infectious bovine rhinothracheitis (IBR), including pyrexia, apathy, anorexia, nasal and ocular mucopurulent discharges, erosions on the nasal mucosa, conjunctivitis, lachrymation, redness of nasal mucosa, dyspnoea, coughing, tracheal stridor and enlargement of retropharingeal, submandibular and cervical lymphnodes. No significant differences were observed between the clinical scores attributed to both groups. Virus shedding in nasal and ocular secretions were also similar, apart from a significant difference in nasal virus shedding on day 1 to 3 post-inoculation, which was higher for BHV-1.1 than for BHV-1.2a. Following corticosteroid induced reactivation of the latent infection, recrudescence of clinical signs was also observed, with no significant differences on both groups. It was concluded that both subtypes BHV-1.1 and BHV-1.2a were able to induce clinically undistinguishable respiratory disease in calves, either subsequent to a primary infection or following reactivation.
Author Weiblen, R
Driemeier, D
Roehe, P.M
Lima, M. de
Chiminazzo, C
Spilki, F.R
Esteves, P.A
Franco, A.C
Flores, E.F
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Snippet O presente estudo teve como objetivo examinar a capacidade de duas amostras de herpesvírus bovino tipo 1 (BHV-1) de diferentes subtipos (amostra EVI 123/96:...
The study aimed to examine the capacity of two bovine herpesvirus type 1 (BHV-1) isolates of different subtypes (EVI 123/96, BHV-1.1; SV265/98, BHV-1.2a) to...
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SubjectTerms ANTIBODIES
ANTICORPO
ANTICORPS
ANTICUERPOS
BHV-1.1
BHV-1.2a
BHV-1.2ª
BOVIN
BOVINO
CATTLE
DOENCA RESPIRATORIA
GANADO BOVINO
HERPESVIRIDAE
HERPESVIRUS
IBR
Infectious bovine rhinotracheitis
PATHOGENICITY
PATOGENICIDAD
PATOGENICIDADE
POUVOIR PATHOGÈNE
RINOTRAQUEITE
Rinotraqueíte infecciosa bovina
SINTOMA
subtipos
subtypes
SYMPTOME
SYMPTOMS
SÍNTOMAS
Title Comparative pathogenicity of bovine herpesvirus 1 (BHV-1) subtypes 1 (BHV-1.1) and 2a (BHV-1.2a)
Volume 24
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