2000
DOI: 10.1590/s0100-736x2000000400002 View full text |Buy / Rent full text
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Abstract: Bovine respiratory syncytial virus (BRSV) has been only sporadically identified as a causative agent of respiratory disease in Brazil. This contrasts with frequent reports of clinical and histopathological findings suggestive of BRSV-associated disease. In order to examine a possible involvement of BRSV in cases of calf pneumonia, a retrospective search was performed for BRSV antigens in histological specimens submitted to veterinary diagnostic services from the states of Rio Grande do Sul and Minas Gerais. Te… Show more

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“…Moreover, this is one of the few studies done in Brazil that has effectively investigated the infectious agents associated with BRD in beef cattle feedlots; we have previously demonstrated H. somni and BoHV-1 associated with respiratory disease in a beef cattle feedlot (HEADLEY et al, 2014), and multiple infectious agents were associated with BRD in dairy cattle (OLIVEIRA, 2014). Although other groups only investigated and confirmed the participation of BRSV in cattle reared in feedlots (BRASIL et al, 2013) and extensively (DRIEMEIER et al, 1997;FLORES et al, 2000) from diverse regions of Brazil, it is rather likely that other infectious disease pathogens associated with BRD might have been identified if these were investigated. Nevertheless, these results are encouraging since the infectious agents thus far identified in feedlot cattle from Brazil with BRD are similar to agents described in North America (GAGEA et al, 2006;GRIFFIN et al, 2010;FRANCOZ et al, 2015) and Australia (CUSACK et al, 2003), where the economic setbacks of respiratory disease on feedlot cattle is been intensively investigated.…”
Section: Discussionmentioning
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rupbmjkragerfmgwileyiopcupepmcmbcthiemesagefrontiersapsiucrarxivemeralduhksmucshluniversity-of-gavle
“…Moreover, this is one of the few studies done in Brazil that has effectively investigated the infectious agents associated with BRD in beef cattle feedlots; we have previously demonstrated H. somni and BoHV-1 associated with respiratory disease in a beef cattle feedlot (HEADLEY et al, 2014), and multiple infectious agents were associated with BRD in dairy cattle (OLIVEIRA, 2014). Although other groups only investigated and confirmed the participation of BRSV in cattle reared in feedlots (BRASIL et al, 2013) and extensively (DRIEMEIER et al, 1997;FLORES et al, 2000) from diverse regions of Brazil, it is rather likely that other infectious disease pathogens associated with BRD might have been identified if these were investigated. Nevertheless, these results are encouraging since the infectious agents thus far identified in feedlot cattle from Brazil with BRD are similar to agents described in North America (GAGEA et al, 2006;GRIFFIN et al, 2010;FRANCOZ et al, 2015) and Australia (CUSACK et al, 2003), where the economic setbacks of respiratory disease on feedlot cattle is been intensively investigated.…”
Section: Discussionmentioning
“…We have theorized that H. somni might be a threat to beef cattle feedlots due to the continual diagnosis of this pathogen in respiratory (HEADLEY et al, 2014), reproductive (HEADLEY et al, 2015b), systemic (HEADLEY et al, 2013), and neurological (HEADLEY et al, 2015a) disease syndromes in cattle from different geographical regions of Brazil. Further, BRSV was associated with BRD in several herds from the state of Rio Grande do Sul, Southern Brazil (DRIEMEIER et al, 1997;BRASIL et al, 2013), while a retrospective study identified antigens of BRSV in cattle with bronchointerstitial pneumonia from Southern and Southeastern Brazil (FLORES et al, 2000). In addition, a recent study has demonstrated the participation of multiple infectious agents with the development of BRD in a dairy cattle herd from Paraná state, Southern Brazil (OLIVEIRA, 2014).…”
Section: Introductionmentioning
“…Recent studies have demonstrated the presence of BRSV antibodies in numerous serum samples, as well as viral antigens in histological specimens used for the diagnosis of bovine infec- tions in the south and southeast regions of the country (6)(7)(8)(9). A serological investigation was performed with 864 serum samples from 65 different farms located in the southern Brazilian states, using serum neutralization test (SNT) and enzyme-linked immunosorbent assay (ELISA), and the clinical history was analyzed.…”
Section: Bovine Respiratory Syncytial Virus (Brsv)mentioning
“…In former studies with samples from autopsied animal tissues, the difficulty in obtaining these free and infective viruses seemed to be greater due to the time elapsed between death, autopsy and inoculation in the cell cultures (6,9). Furthermore, it is easier to obtain tissue samples from animals autopsied during the acute phase of the disease (10).…”
Section: -Brmentioning
“…Very little is known about the significance of BRSV in Brazil. Recent studies have shown BRSV antibodies in numerous serum samples and BRSV specific antigens have been detected in histological specimens of bovines submitted to veterinary diagnosis in the southern and southeastern regions of Brazil [4,9,11,13].…”
Section: Introductionmentioning