Investigations into bovine viral diarrhoea virus in a dairy herd

Barber, D M; Nettleton, P. F.

doi:10.1136/vr.133.22.549

Cited by 19 publications

(7 citation statements)

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“…Furthermore, PI animals are already young enough to give birth to further PI animal(s) (Constable et al 2017;. Two studies have shown that the BVD virus can circulate in a herd for 2-3 years despite no PI animals being present and no direct contact with PI cows occurring (Barber and Nettleton 1993;Moerman et al 1993). Therefore, the actual prevalence of PI animals in this study may be higher than the obtained results.…”

Section: Discussionmentioning

confidence: 57%

Investigation of persistent infection of bovine viral diarrhea virus (BVDV) in Holstein dairy cows

Garoussi

Mehrzad

Nejati

2018

Trop Anim Health Prod

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The aim of this study was to investigate the persistent infection (PI) of bovine viral diarrhea virus (BVDV) along with its coexistence between BVDV antibody titer and BVD virus in blood of Holstein dairy cows. Only large commercial farms (each contained < 1000-3000 unvaccinated cows) were included. There were 11 dairy cattle herds. They included nearly 20,000 dairy cows. Totally, 140 cows, > 3 months to almost 10 years old, were randomly sampled. Indirect enzyme-linked immunosorbent assay (ELISA) and reverse transcription-polymerase chain reaction (RT-PCR) were used to detect BVDV antibody and virus, respectively. The percent positivity (PP) < 14 and ≥ 14 values are interpreted negative and positive, respectively. Simultaneously, whole blood samples pooled in groups of 10 animals were used for molecular detection of BVDV. The results revealed that 138 (98.56%) out of 140 cows were positive for BVDV antibody, while the BVDV antigen was detected only in 2 (1.42%) cows, which were negative for BVDV antibody and so were considered as persistent infection (PI) cows. They were also retested 3 weeks apart. Since the results showed the strong coexistence between seropositivity and BVD virus, in the infected dairy cattle herds, the combination of simple ELISA and pooled whole blood RT-PCR strategy could be an achievable approach to detect PI animals.

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Section: Discussionmentioning

confidence: 57%

Investigation of persistent infection of bovine viral diarrhea virus (BVDV) in Holstein dairy cows

Garoussi

Mehrzad

Nejati

2018

Trop Anim Health Prod

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“…The MASTAZYME ELISA test for antibody to N caninum was validated for fetal fluid against the indirect fluorescent antibody test of Buxton and others (1997a) (C. Low and A. Schock, personal communication). Blood samples collected from the 13 cows which aborted between August 11 and 29 were tested for antibody to bovine viral diarrhoea (BVD) virus by ELISA (Barber and Nettleton 1993). To investigate the epidemiology of neosporosis in the herd, a serological survey for N caninum antibody was carried out.…”

Section: Investigationmentioning

confidence: 99%

Abortion epidemic in a dairy herd associated with horizontally transmittedNeospora caninuminfection

Crawshaw¹,

Brocklehurst

2003

Veterinary Record

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A dairy herd experienced an abortion epidemic during which 43 per cent of the cows at risk aborted. Neospora caninum infection was demonstrated in four of six fetuses suitable for examination and the group of at-risk cows that aborted had significantly higher N. caninum antibody concentrations than the at-risk cows that delivered a live calf at term (P<0.001). The antibody concentrations in the cow herd were significantly higher than in the youngstock (P<0.001), and the concentrations in the youngstock increased significantly (P<0.001) with age. When seven months to a year old, the calves born at term to the at-risk cows had significantly higher (P=0.007) antibody concentrations than age-matched calves born before the epidemic. At the time of the epidemic, there was a significant increase in the antibody levels of the herd that was not consistent with vertical infection alone, indicating that there appeared to have been a sudden large increase in the incidence of horizontal postnatal transmission of N. caninum to the cow herd, or to the surviving offspring of the at-risk cows, or to both of these groups.

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“…Blood and faecal samples were collected for analysis, and the results are shown in Table 1. Antibody to adult D viviparus (Wassall 1991) was present in 11 calves; all the calves were negative for bovine viral diarrhoea virus antibody (Barber and Nettleton 1993) and antigen (Barber and others 1985). Routine haematological examination was unremarkable with eosinophil counts ranging from 0 to 0·2 × 10 9 /litre (reference range 0 to 2·0 × 10 9 /litre).…”

Section: Calf (Age Order: Youngest To Oldest) Rectal Temperature (°C)mentioning

confidence: 99%

Dictyocaulosis in housed five‐ to eight‐month‐old dairy‐bred calves

Crawshaw¹,

Smith²

2003

Veterinary Record

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Investigations into bovine viral diarrhoea virus in a dairy herd

Cited by 19 publications

References 0 publications

Investigation of persistent infection of bovine viral diarrhea virus (BVDV) in Holstein dairy cows

Investigation of persistent infection of bovine viral diarrhea virus (BVDV) in Holstein dairy cows

Abortion epidemic in a dairy herd associated with horizontally transmittedNeospora caninuminfection

Dictyocaulosis in housed five‐ to eight‐month‐old dairy‐bred calves

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