Abstract
This paper describes a solid-phase microtitre plate enzyme-linked immunosorbent assay (ELISA) for the detection of antibodies to equine influenza viruses. Using egg-grown influenza viruses as the antigens attached to the solid phase, cross-reactions were observed between an H7N7 equine virus (designated A1) and an H3N8 equine influenza virus (designated A2) when untreated antisera were tested. Absorption of antisera with egg-grown A/Porcine/Shope/1/33 influenza virus eliminated cross-reactive antibodies so that specific detection of anti-equine influenza A1 or A2 antibodies was possible. Examination of horse sera following vaccination with A1 and/or A2 isolates showed that antibodies were produced against antigen associated with egg allantoic fluid as well as against virus. Such antibodies were eliminated following the absorption of antisera with porcine influenza virus. Results using sera from horses with known vaccination histories confirmed that the ELISA preferentially detected antibodies homologous to the antigen attached to the solid phase and methods to evaluate the current serological state of individual horses by relating the titres of specific antibodies against equine influenza A1 and A2 isolates are shown. This ELISA provides a simple and rapid method of assessing specific antibodies from horse sera and offers advantages over the 'routine' HI and SRH assessments since it gives high precision, is economical of reagents and has the capacity to handle large numbers of serum samples.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Abu Elzein E. M., Crowther J. R. Differentiation of foot-and-mouth disease virus strains using a competition enzyme-linked immunosorbent assay. J Virol Methods. 1982 Jan;3(6):355–365. doi: 10.1016/0166-0934(82)90040-4. [DOI] [PubMed] [Google Scholar]
- Burrows R., Denyer M. Antigenic properties of some equine influenza viruses. Arch Virol. 1982;73(1):15–24. doi: 10.1007/BF01341723. [DOI] [PubMed] [Google Scholar]
- John T. J., Fulginiti V. A. Parainfluenza 2 virus: increase in hemagglutinin titer on treatment with Tween-80 and ether. Proc Soc Exp Biol Med. 1966 Jan;121(1):109–111. doi: 10.3181/00379727-121-30711. [DOI] [PubMed] [Google Scholar]
- Nakane P. K., Kawaoi A. Peroxidase-labeled antibody. A new method of conjugation. J Histochem Cytochem. 1974 Dec;22(12):1084–1091. doi: 10.1177/22.12.1084. [DOI] [PubMed] [Google Scholar]
- Schild G. C., Pereira M. S., Chakraverty P. Single-radial-hemolysis: a new method for the assay of antibody to influenza haemagglutinin. Applications for diagnosis and seroepidemiologic surveillance of influenza. Bull World Health Organ. 1975;52(1):43–50. [PMC free article] [PubMed] [Google Scholar]