- Brief Communication
Studies on the Decline of Bovine Virus Diarrhoea Virus (BVD V) Maternal Antibodies and Detectability of BVDV in Persistently Infected Calves
Acta Veterinaria Scandinavica volume 34, pages 105–107 (1993)
Persistently infected (PI) animals play a significant role in spread and transmission of bovine virus diarrhoea virus (B VD V) (Duffell & Harkness 1985). The identification and removal of PI cattle from the herd is of great importance in the control of BVDV. Although PI animals often show various degrees of growth retardation and unthrifty appearance, a significant proportion is clinically normal. PI animals are often seronegative (Duffell & Harkness 1985), but calves may be tested seropositive because of the presence of maternal immunity (Meyling & Jensen 1988). The passively derived BVDV antibodies may interfere with the ability to detect virus. Considering the importance of early recognition of PI calves, it is essential to determine the earliest time when PI animals can safely be diagnosed in the herd.
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Palfi, V., Houe, H. & Philipsen, J. Studies on the Decline of Bovine Virus Diarrhoea Virus (BVD V) Maternal Antibodies and Detectability of BVDV in Persistently Infected Calves. Acta Vet Scand 34, 105–107 (1993). https://doi.org/10.1186/BF03548231