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Published in: Virology Journal 1/2009

Open Access 01-12-2009 | Research

Detection of NP, N3 and N7 antibodies to avian influenza virus by indirect ELISA using yeast-expressed antigens

Authors: Chitra Upadhyay, Arun Ammayappan, Vikram N Vakharia

Published in: Virology Journal | Issue 1/2009

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Abstract

Background

Avian influenza viruses, belonging to the family Orthomyxoviridae, possess distinct combinations of hemagglutinin (H) and the neuraminidase (N) surface glycoproteins. Typing of both H and N antigens is essential for the epidemiological and surveillance studies. Therefore, it is important to find a rapid, sensitive, and specific method for their assay, and ELISA can be useful for this purpose, by using recombinant proteins.

Results

The nucleoprotein (NP) and truncated neuraminidase subtype 3 and 7 of avian influenza virus (AIV) were expressed in Saccharomyces cerevisiae and used to develop an indirect enzyme-linked immunosorbent assay for antibody detection. The developed assays were evaluated with a panel of 64 chicken serum samples. The performance of NP-ELISA was compared with the commercially available ProFlok® AIV ELISA kit. The results showed comparable agreement and sensitivity between the two tests, indicating that NP-ELISA assay can be used for screening the influenza type A antibody in AIV infected birds. The N3 and N7- ELISAs also reacted specifically to their type specific sera and did not exhibit any cross-reaction with heterologous neuraminidase subtype specific sera.

Conclusion

The study demonstrates the expression of the NP, N3, and N7 proteins of AIV in yeast (S. cerevisiae) and their application in developing an indirect ELISA for detecting NP, N3 and N7 antibodies from AIV-infected chicken sera. The described indirect ELISAs are rapid, sensitive, specific and can be used as promising tests during serological surveillance.
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Metadata
Title
Detection of NP, N3 and N7 antibodies to avian influenza virus by indirect ELISA using yeast-expressed antigens
Authors
Chitra Upadhyay
Arun Ammayappan
Vikram N Vakharia
Publication date
01-12-2009
Publisher
BioMed Central
Published in
Virology Journal / Issue 1/2009
Electronic ISSN: 1743-422X
DOI
https://doi.org/10.1186/1743-422X-6-158

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