Identification of Korean native cattle persistently infected with BVDV using Ear-notch method

다국어 초록 (Multilingual Abstract)

Bovine viral diarrhea Virus (BVDV) infections cause respiratory, gastrointestinal, and reproductive prob-lems, such as infertility, abortion, stillbirth, and sickly offspring. Many countries have reduced the eco-nomic damage through the application of different control programmes, and some have successfully eradi-cated BVD. Detection and elimination of cattle persistently infected (PI) with BVDV is important for BVD eradication because PI cattle are a main source of BVD transmission. In this study, the prevalence of Korean native cattle persistently infected (PI) with BVDV was investigated and determined in 49 farms with 3,050 cattle. The all samples were collected by ear notch sampling. Korean native cattle with initial positives on antigen-ELISA (Ag-ELISA) were sampled again after 3∼4 weeks and cattle with second positives in both Ag-ELISA and immunohistochemistry (IHC) were identified as PI cattle. Among the 49 farms, 14 (28.6%) farms had at least more than one PI cow and 21 (0.69%) of 3,050 cattle were determined as PI cattle. As a result of this work, it is suggested that national BVD eradication program is required to reduce economic losses by BVDV infection in Korean cattle industries.

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