Development of competitive ELISA for serodiagnosis on African horsesickness virus using baculovirus expressed VP7 and monoclonal antibody.

This research article presents the development of a competitive ELISA, a specific diagnostic method for detecting the African horsesickness virus (AHSV) using the virus’s VP7 antigen as well as a monoclonal antibody. The method outperforms another ELISA type in terms of specificity and can be used in the serodiagnosis of AHSV regardless of its different strains or serotypes.

Objectives and Methodology

• The main objective of the study was to develop a unique diagnostic method for the African horsesickness virus (AHSV). This was motivated by the need for a more specific test unrelated to the various serotypes of the virus.
• The researchers utilized recombinant baculovirus to express VP7, an antigen common to sero-groups of AHSV virus. This was done in insect cells.
• A monoclonal antibody (Mab) against the expressed VP7 was prepared and tested as a potential diagnostic reagent.
• This research also facilitated an indirect immunofluorescence assay (IFA) test to verify possible cross-reactions between AHSV and Chuzan virus.

Research Findings

• The Mab against VP7 of AHSV was found to cross-react with Chuzan virus. This confirmed the existence of a conserved domain of VP7 amongst Orbiviruses.
• Two types of ELISA tests were outlined in the study; Mab-linked indirect (I-ELISA) and competitive-ELISA (C-ELISA) using the baculovirus expressed VP7 as an antigen.
• The results indicated that C-ELISA outperformed the I-ELISA in terms of specificity for the serodiagnosis of AHSV.

Implications and Conclusions

• The research concluded that based on their investigation, C-ELISA is more suitable for serodiagnosis of AHSV regardless of serotypes.
• This implies the potential applicability of this method for detecting different strains of AHSV, increasing its diagnostic versatility and potential use in huge-scale testing scenarios.
• The study’s findings hint at the importance of the VP7 antigen and its conserved status among Orbiviruses, suggesting its potential future importance in virus diagnosis and even possibly treatment research.