Resultado da pesquisa (2)

Termo utilizado na pesquisa Orthopoxvirus

#1 - Outbreaks of vesicular disease caused by Vaccinia virus in dairy cattle from Goiás State, Brazil (2010-2012), 33(7):860-866

Abstract in English:

ABSTRACT.- Sant’Ana F.J.F., Leal A.A., Rabelo R.E., Vulcani V.A.S., Ferreira Junior J.A., Cargnelutti J.F. & Flores E.F. 2013. Outbreaks of vesicular disease caused by Vaccinia virus in dairy cattle from Goiás State, Brazil (2010-2012). Pesquisa Veterinária Brasileira 33(7):860-866. Laboratório de Patologia Veterinária, Universidade de Brasília, Brasília, DF 70910-900, Brazil. E-mail: santanafjf@yahoo.com Cases of vesicular and exanthematic disease by Vaccinia virus (VACV) have been reported in dairy herds of several Brazilian regions, occasionally also affecting humans. The present article describes eight outbreaks of vesicular disease caused by VACV in dairy herds of six counties of Goiás state, Midwestern Brazil (2010-2012), involving a total of 122 cows, 12 calves and 11 people. Dairy cows (3 to 9 years old) were affected in all cases and calves (2 to 9 months old) were affected in five outbreaks, presenting oral lesions. The morbidity ranged between 8 and 100% in cows, and 1.5 to 31% in calves. In the cows, the clinical signs started with vesicles (2-7mm), painful and coalescent papules (3-8 mm), which resulted in ulcers (5-25mm) and scabs in teats, and, occasionally, in the muzzle. The clinical course lasted from 16 to 26 days. The histopathology of bovine skin samples revealed superficial perivascular inflammatory infiltrate of lymphocytes, plasma cells, neutrophils, macrophages and multifocal areas of acanthosis, spongiosis, hipergranulosis and parakeratotic or orthokeratotic hyperkeratosis with adjacent focally extensive ulcers. Eosinophilic inclusion bodies were noted in the cytoplasm of the keratinocytes. PCR to vgf gene of Orthopoxvirus was positive in samples collected from all outbreaks, and in some cases, genomic VACV sequences were identified by nucleotide sequencing of the PCR amplicons. Infectious virus was isolated in cell culture from scabs from one outbreak. Antibodies to Orthopoxvirus were detected in at least 3 or 4 animals in most outbreaks, by ELISA (outbreaks 1, 2, 3, 4, 5 and 7) or virus-neutralization (outbreak 6). Neutralizing titers ranging from 8 to 64 in outbreak 6. In all outbreaks, VACV infection was suspected based on the clinical and pathological findings and it was confirmed by laboratory tests. Upon the etiological confirmation, other agents associated with vesicular disease were discarded. In all outbreaks, at least one milker who handled the affected cows developed malaise, headache, fever, painful vesico-pustular lesions mainly in the hands, but also in the neck and nose. These results confirm the circulation of VACV in the region and call attention for a correct diagnosis and the adoption of prophylactic and control measures.

Abstract in Portuguese:

RESUMO.- Sant’Ana F.J.F., Leal A.A., Rabelo R.E., Vulcani V.A.S., Ferreira Junior J.A., Cargnelutti J.F. & Flores E.F. 2013. Outbreaks of vesicular disease caused by Vaccinia virus in dairy cattle from Goiás State, Brazil (2010-2012). [Surtos de doença vesicular causados pelo Vaccinia virus em bovinos de leite no Estado de Goiás, Brasil (2010-2012).] Pesquisa Veterinária Brasileira 33(7):860-866. Laboratório de Patologia Veterinária, Universidade de Brasília, Brasília, DF 70910-900, Brazil. E-mail: santanafjf@yahoo.com Casos de doença vesicular e exantemática associados ao Vaccinia virus (VACV) têm sido descritos em rebanhos leiteiros em diversas regiões do Brasil, ocasionalmente afetando também os ordenhadores. Este artigo descreve oito surtos de doença vesicular associados ao VACV ocorridos em rebanhos leiteiros de seis municípios do estado de Goiás (2010-2012), com o envolvimento de 122 vacas em lactação, de 12 bezerros e de 11 pessoas. Vacas em lactação (3-9 anos de idade) foram afetadas em todos os casos. Em cinco rebanhos, bezerros de 2-9 meses apresentaram lesões orais. A morbidade nos rebanhos variou entre oito e 100% (vacas) e entre 1,5 e 31% (bezerros). As lesões iniciavam como vesículas (2-7mm) ou pápulas doloridas e coalescentes (3-8mm), que progrediam para úlceras (5-25mm) e crostas, localizadas principalmente nas tetas e, eventualmente, no focinho das vacas. O curso clínico variou entre 16 e 26 dias. Histopatologia de amostras de pele coletadas de bovinos revelou dermatite perivascular superficial com infiltrado de linfócitos, neutrófilos, plasmócitos e macrófagos, além de áreas multifocais de acantose, espongiose, hipergranulose e hiperceratose ortoceratótica ou paraceratótica com úlceras focalmente extensas. No citoplasma dos ceratinócitos adjacentes às úlceras, observaram-se numerosos corpúsculos de inclusão eosinofílicos. Em todos os surtos, amostras de lesões cutâneas dos bovinos foram positivas para o gene vgf dos Orthopoxvirus por PCR, e em alguns casos, a identificação do VACV foi confirmada por sequenciamento de nucleotídeos dos amplicons. O vírus foi detectado por isolamento em cultivo celular em um dos surtos e, pelo menos 2 a 3 vacas por rebanho, apresentaram sorologia positiva para Orthopoxvirus pelos testes de ELISA (surtos 1, 2, 3, 4, 5 e 7) e soroneutralização (surto 6). No surto 6, os títulos de anticorpos neutralizantes variaram de 8 a 64. O diagnóstico da infecção pelo VACV, inicialmente suspeito com base nos achados clínicos e patológicos, foi confirmado em todos os surtos por exames laboratoriais. Em todos os surtos, pelo menos um ordenhador que teve contato com os bovinos afetados apresentou mal-estar geral, febre alta, dor de cabeça e lesões vesiculo-pustulosas doloridas, principalmente nas mãos, mas também no pescoço e nariz. Esses resultados confirmam a circulação do VACV no rebanho bovino da região centro-oeste, alertando para necessidade de diagnóstico correto e adoção de medidas profiláticas e de controle.


#2 - Animal infections by vaccinia-like virus in the state of Rio de Janeiro: An expanding disease, p.509-514

Abstract in English:

ABSTRACT.- Schatzmayr H.G., Simonetti B.R., Abreu D.C., Simonetti J.P., Simonetti S.R., Costa R.V.V., Gonçalves M.C.R., Gerhardt M.., Silva M.E.V., Farias-Filho J.C. & Barth O.M. 2009. Animal infections by vaccinia-like virus in the state of Rio de Janeiro: An expanding disease. Pesquisa Veterinária Brasileira 29(7):509-514. Laboratório de Morfologia e Morfogênese Viral, Instituto Oswaldo Cruz, Fiocruz, Avenida Brasil 4365, Rio de Janeiro, RJ 21040-900, Brazil. E-mail: hermann@ioc.fiocruz.br In the present study we investigated the presence of infections by vaccinia-like viruses in dairy cattle from 12 counties in the state of Rio de Janeiro in the last 9 years. Clinical specimens were collected from adult animals with vesicular/pustular lesions mainly in the udder and teats, and from calves with lesions around the nose and mouth. A plaque reduction neutralization test (PRNT) was applied to search for antibodies to Orthopoxvirus; the vesicular/pustular fluids and scabs were examined by PCR, electron microscopy (EM) and by inoculation in VERO cells for virus isolation. Antibodies to Orthopoxvirus were detected in most cases. The PCR test indicated a high nucleotide homology among the isolates and the vaccinia viruses (VACV) used as controls. By EM, typical orthopoxvirus particles were observed in some specimens. The agents isolated in tissue culture were confirmed as vaccinia-like viruses by EM and PCR. The HA gene of the vaccinia-like Cantagalo/IOC virus isolated in our laboratory was sequenced and compared with other vaccinia-like isolates, showing high homology with the original Cantagalo strain, both strains isolated in 1999 from dairy cattle. Antibodies to Orthopoxvirus were detected in one wild rodent (genus Akodon sp.) collected in the northwestern region of the state, indicating the circulation of poxvirus in this area. Nonetheless, PCR applied to tissue samples collected from the wild rodents were negative. Vesicular/pustular lesions in people in close contact with animals have been also recorded. Thus, the vaccinia-like virus infections in cattle and humans in the state seem to be an expanding condition, resulting in economic losses to dairy herds and leading to transient incapacitating human disease. Therefore, a possible immunization of the dairy cattle in the state should be carefully evaluated.

Abstract in Portuguese:

ABSTRACT.- Schatzmayr H.G., Simonetti B.R., Abreu D.C., Simonetti J.P., Simonetti S.R., Costa R.V.V., Gonçalves M.C.R., Gerhardt M.., Silva M.E.V., Farias-Filho J.C. & Barth O.M. 2009. Animal infections by vaccinia-like virus in the state of Rio de Janeiro: An expanding disease. Pesquisa Veterinária Brasileira 29(7):509-514. Laboratório de Morfologia e Morfogênese Viral, Instituto Oswaldo Cruz, Fiocruz, Avenida Brasil 4365, Rio de Janeiro, RJ 21040-900, Brazil. E-mail: hermann@ioc.fiocruz.br In the present study we investigated the presence of infections by vaccinia-like viruses in dairy cattle from 12 counties in the state of Rio de Janeiro in the last 9 years. Clinical specimens were collected from adult animals with vesicular/pustular lesions mainly in the udder and teats, and from calves with lesions around the nose and mouth. A plaque reduction neutralization test (PRNT) was applied to search for antibodies to Orthopoxvirus; the vesicular/pustular fluids and scabs were examined by PCR, electron microscopy (EM) and by inoculation in VERO cells for virus isolation. Antibodies to Orthopoxvirus were detected in most cases. The PCR test indicated a high nucleotide homology among the isolates and the vaccinia viruses (VACV) used as controls. By EM, typical orthopoxvirus particles were observed in some specimens. The agents isolated in tissue culture were confirmed as vaccinia-like viruses by EM and PCR. The HA gene of the vaccinia-like Cantagalo/IOC virus isolated in our laboratory was sequenced and compared with other vaccinia-like isolates, showing high homology with the original Cantagalo strain, both strains isolated in 1999 from dairy cattle. Antibodies to Orthopoxvirus were detected in one wild rodent (genus Akodon sp.) collected in the northwestern region of the state, indicating the circulation of poxvirus in this area. Nonetheless, PCR applied to tissue samples collected from the wild rodents were negative. Vesicular/pustular lesions in people in close contact with animals have been also recorded. Thus, the vaccinia-like virus infections in cattle and humans in the state seem to be an expanding condition, resulting in economic losses to dairy herds and leading to transient incapacitating human disease. Therefore, a possible immunization of the dairy cattle in the state should be carefully evaluated.


Colégio Brasileiro de Patologia Animal SciELO Brasil CAPES CNPQ UNB UFRRJ CFMV