Evaluation of a Monoclonal Antibody Blocking ELISA for the Detection of Group-specific Antibodies to Bluetongue Virus in Experimental and Field Sera Free

Abstract

Summary

In order to overcome serological cross-reactions among orbivirus serogroups, which can hinder the accurate diagnosis of bluetongue virus (BTV) infection of livestock, a blocking ELISA (B-ELISA) incorporating a monoclonal antibody (20E9B7G2) with specificity for the BTV serogroup was developed. Experimental antisera raised to South African BTV serotypes 1 to 19 were tested in the B-ELISA and all blocked the binding of 20E9B7G2 to BTV antigen. The sensitivity and specificity of the assay was evaluated with a range of experimental and field sera and compared to a sensitive indirect ELISA (I-ELISA) for the detection of BTV-specific antibodies. The specificity of the B-ELISA was absolute for antibodies to BTV, showing no cross-reaction with experimental antisera to serotypes of the closely related orbivirus causing epizootic haemorrhagic disease of deer. The sensitivity of the B-ELISA exceeded that of the I-ELISA. In particular, the B-ELISA detected a BTV-specific antibody response much earlier after infection that the I-ELISA, while still exhibiting full sensitivity to BTV antibody titres several months after infection.

Keyword(s): blocking ELISA , BTV and MAb
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1988-11-01
2024-03-29
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