False-Positive Results in a Recombinant Severe Acute Respiratory Syndrome-Associated Coronavirus (SARS-CoV) Nucleocapsid Enzyme-Linked Immunosorbent Assay Due to HCoV-OC43 and HCoV-229E Rectified by Western Blotting with Recombinant SARS-CoV Spike Polypeptide

Author:

Woo Patrick C. Y.1,Lau Susanna K. P.1,Wong Beatrice H. L.1,Chan Kwok-Hung1,Hui Wai-Ting1,Kwan Grace S. W.1,Peiris J. S. Malik1,Couch Robert B.2,Yuen Kwok-Yung1

Affiliation:

1. Department of Microbiology, The University of Hong Kong, Hong Kong

2. Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas

Abstract

ABSTRACT Using paired serum samples obtained from patients with illness associated with increases in anti-human coronavirus OC43 (HCoV-OC43) or anti-HCoV-229E antibodies, we examined the possibility of false-positive results detected in a recombinant severe acute respiratory syndrome (SARS)-associated coronavirus (SARS-CoV) nucleocapsid protein immunoglobulin G enzyme-linked immunosorbent assay (ELISA). Three of the 21 and 1 of the 7 convalescent-phase serum samples from persons with increases in antibodies against HCoV-OC43 and HCoV-229E, respectively, tested positive by the recombinant SARS-CoV nucleocapsid protein-based ELISA. None of these samples were found to contain a specific antibody in the recombinant SARS-CoV spike polypeptide-based Western blot assay.

Publisher

American Society for Microbiology

Subject

Microbiology (medical)

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