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Evaluation of an enzyme-linked immunosorbent assay that uses the 41-kd flagellin as the antigen for detection of antibodies to Borrelia burgdorferi in cattle.
1994
Ji B. | Thomas C.B. | Collins M.T.
An ELISA was developed to detect antibodies to the 41-kd flagellin (P41) of Borrelia burgdorferi in serum obtained from cattle. Absorption studies, immunoblot analysis, immunoelectron microscopy, and correlation of results of the P41-ELISA and the P39-ELISA as well as measurement of the antibody to P41 in calves challenge-exposed with Borrelia theileri were used to assess the specificity of the P41-ELISA. Antigens derived from Escherichia coli, Leptospira interrogans serovar hardjo, and B burgdorferi were used for absorption studies and immunoblot analysis. Antibodies to P41 of B burgdorferi cross-reacted with antigens of E coli, but were not cross-reactive with L hardjo. A value 3 SD higher than the mean of the negative-control population of cattle was defined as the minimum value cutoff value) for a positive result by the P41-ELISA. Use of this value for classification of test results reduced the predicted rate of false-positive results attributable to E coli cross-reactivity to 1%. Immunoblot analysis revealed that test-positive serum from cattle reacted mainly with 41-, 39-, 34-, and 31-kd proteins of B burgdorferi, as well as several smaller proteins. Immunoelectron microscopy revealed that serum from cattle that was test-positive by the P41-ELISA bound to the flagellin and outer membrane of B burgdorferi. Results of absorption studies, immunoblot analysis, and immunoelectron microscopy were correlated and indicated that serum from cattle that was test-positive by P41-ELISA had stronger reactivity to B burgdorferi antigens than to antigens of E coli or L hardjo. The concentrations of antibodies measured by P41-ELISA and P39-ELISA testing were highly correlated [R(2)=0.78]. Calves challenge-exposed with B theileri also had test-positive results by the P-41-ELISA as early as 2 weeks after exposure, but serum antibody concentrations decreased to prechallenge-exposure concentrations by 9 weeks after exposure.
Show more [+] Less [-]Progesterone assays as an aid for improving reproductive efficiency in dairy cattle-(2)-Use of plasma or milk progesterone profiles for differential diagnosis of ovarian cysts
1994
Kang, B.K. | Choi, H.S. | Son, C.H. | Chon, H.S. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine) | Choi, S.G. (Suhkwang Livestock Company, Ltd., Kwangju (Korea Republic))
Progesterone assays as an aid for improving reproductive efficiency in dairy cattle-(4)-Milk progesterone profiles for monitoring postpartum ovarian activity
1994
Kang, B.K. | Choi, H.S. | Son, C.H. | Kang, H.K. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine) | Choi, S.G. (Suhkwang Livestock Company, Ltd., Kwangju (Korea Republic))
Progesterone assays as an aid for improving reproductive efficiency in dairy cattle-(1)-Use of milk progesterone profiles in the confirmation of estrus detection and early pregnancy diagnosis
1994
Kang, B.K. | Choi, H.S. | Son, C.H. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine) | Choi, S.G. (Suhkwang Livestock Company Ltd., Kwangju (Korea Republic))
A survey of paratuberculosis by immunological methods in dairy and Korean native cattle
1994
Kim, J.M. | Ahn, J.S. | Woo, S.R. | Jo, D.H. | Jo, Y.S. | Park, J.M. | Yoon, Y.D. (Rural Development Administration, Anyang (Korea Republic). Veterinary Research Institute) | Chang, G.H. (Kangwon Veterinary Service Laboratory, Chunchon (Korea Republic). Chungbu Branch)
Studies on the Clostridium bovis sp. nov., the predominant species isolated from the feces of Holstein cattle
1994
Lee, W.K. (Chungbuk National University, Cheongju (Korea Republic). College of Veterinary Medicine)
Project to increase productivity of livestock in Honam area against UR
1994
Lee, J.M. | Kwon, O.D. | Chae, J.S. | Kim, M.C. | Kim, H.S. (Chonbuk National University, Chonju (Korea Republic). College of Veterinary Medicine) | Lee, S.J. | Lee, H.S. | Roh, S.I. | Kim, K.S. (Chonbuk Veterinary Service Laboratory, Chonju (Korea Republic))
