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Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2007.tde-11072007-111349
Document
Author
Full name
Sabrina Sonza
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Jerez, José Antonio (President)
Gregori, Fabio
Moreno, Andrea Micke
Title in Portuguese
Disenteria de inverno: detecção de coronavírus bovino (BCoV) por reação de PCR dirigida ao gene Rp Rd e isolamento em cultivo celular de HRT-18G
Keywords in Portuguese
Coronavirose
Disenteria de inverno
Isolamento
PCR
Abstract in Portuguese
Coronavirus bovino (BCoV), um membro da família i>Coronaviridae, causa severa diarréia em bezerros neonatos e tem sido associado a diarréias de inverno em vacas leiteiras em vários paises, incluindo o Brasil. A morbidade da disenteria de inverno e alta chegando ate 100% , sendo um fator importante para economia já que causa queda da produção leiteira, levando a grandes perdas as criações de vacas leiteiras. O objetivo deste trabalho foi pesquisar a ocorrência de BCoV em vacas, diagnosticando amostras positivas por RT-PCR gene Rp Rd e isolando estas amostras positivas em células da linhagem HRT-18G. As amostras de fecais foram obtidas de 43 vacas leiteiras com disenteria de 8 propriedades dos Estados de São Paulo e Minas Gerais, Brasil. Das dez (10/43=23%) amostras positivas para esta técnica, 7 foram inoculadas em células da linhagem HRT-18G, sendo que o isolamento foi comprovado pela mesma técnica após seis passagens seriadas em 4 inoculações. Com isso, mostra-se que o BCoV também esta envolvido em disenterias de inverno em vacas leiteiras no Brasil. E através de isolamentos deste vírus, podemos contribuir para estudos continuados ajudar no esclarecimento de sua epidemiologia e possibilitar com um banco de vírus a prevenção de ordem também especifica da enfermidade.
Title in English
Winter dysentery: detection of bovine coronavirus (BCoV) by RT-PCR for the Rp Rd gene and isolation in monolayers of HRT-18G cells
Keywords in English
Coronavirus
Isolation
PCR
Winter dysentery
Abstract in English
Bovine coronavirus (BCoV), a member of Coronaviridae family, causes severe diarrhea in newborn calves and has been associated with outbreaks of winter dysentery (WD) in adult cattle in several countries, including Brazil. The morbidity rate of WD is very high (50-100%) and the disease causes severe economic losses once it decreases milk production. The aim of the present study was to survey for the occurrence of BCoV in cows using a RT-PCR targeted to the replicase gene and to isolate positive samples in HRT-18G cells. The fecal samples were obtained from 43 adult dairy cows with dysentery from São Paulo and Minas Gerais States, Brazil. Ten (23%) of the 43 fecal samples were positive for BCoV and 7 of these were inoculated in HRT-18G cells, when the isolation of 4 samples was proved by RT-PCR after sex passages. These findings indicate that BCoV is also involved in outbreaks of dysentery in adult cattle in Brazil. This shows the importance of more comprehensive studies on coronavirus in dairy cattle in the surveyed area and, with the isolation of the virus strains studied herein, one may contribute to other studies to enlighten the epidemiology and prevention of the disease.
 
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Sabrina_Sonza.pdf (1.16 Mbytes)
Publishing Date
2007-07-13
 
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