A sandwich ELISA test using PPR specific monoclonal antibody (clone 4G6) to an epitope of nucleocapsid protein has been developed. The test uses polyclonal sera to capture the antigen from clinical samples (swabs and tissues). Captured antigens from clinical samples are detected using PPR specific monoclonal antibody. The test is specific to PPR as it failed to detect rinderpest vaccine virus (RBOK strain). Varieties of clinical samples originating from laboratory experiments (n = 231) and from field (n = 259) were employed to test the efficacy of sandwich-ELISA test. The test compared very well with an internationally accepted commercial Immune-capture ELISA kit, which uses biotinylated monoclonal antibody against the nucleocapsid protein. On a parallel testing using 490 clinical samples, 4G6 MAb based sandwich ELISA had an overall relative diagnostic specificity of 92.8% and diagnostic sensitivity of 88.9% compared to the commercial kit. The newly developed test is free from prozone phenomenon. PPR outbreaks from various parts of India have been confirmed using the test. Findings suggested that the newly developed ELISA is suitable for PPR diagnosis under field conditions.
Archives of Virology – Springer Journals
Published: Nov 1, 2004
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