Abstract
We developed a fast, rabies virus-free, in vitro method, based on a blocking ELISA (bELISA), to detect and accurately quantify anti-rabies glycoprotein antibodies in serum of several animal species. In this method, purified rabies virus-like particles (VLPs) are used as antigen to coat the plates, while the presence of specific rabies immunoglobulins is revealed through blocking the recognition of these VLPs by a biotinylated monoclonal antibody. A quality by design approach was carried out in order to optimize the method performance, improving the sensitivity and, thereby, reducing the limit of detection of this assay. After the method validation, we confirmed that the bELISA method is able to detect a concentration of 0.06 IU/mL rabies immunoglobulins, titer lower than the 0.5 IU/mL cutoff value established as indication for correct vaccination. Further, we assessed the correlation between bELISA, the MNT, and the Platelia methods, confirming the accuracy of this new assay. On the other hand, precision was evaluated, obtaining acceptable repeatability and intermediate precision values, showing that this bELISA could be proposed as a potential alternative method, replacing the gold standard techniques in vaccination schemes and becoming a routine control technique within regional rabies surveillance programs.
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Acknowledgments
We want to thank Dr. Jesica Risiglione from the “Instituto de Zoonosis Luis Pasteur” of Buenos Aires city, Argentina, for her disinterested help and for giving us human sera to carry out this investigation. Thanks to Eugenia Dalla Fontana for her help in the language correction of this manuscript.
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Informed consent was obtained from all volunteers according to the ethical guidelines for human subject research. The project was approved by the ethical committee from Facultad de Bioquímica y Ciencias Biológicas of the Universidad Nacional del Litoral, Santa Fe, Argentina, and with the endorsement of the National Network of Rabies Diagnostic Laboratories (Argentina).
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Fontana, D., Rodriguez, M.C., Garay, E. et al. Optimization and validation of a blocking ELISA for quantitation of anti-rabies immunoglobulins in multispecies sera. Appl Microbiol Biotechnol 104, 4127–4139 (2020). https://doi.org/10.1007/s00253-020-10490-6
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DOI: https://doi.org/10.1007/s00253-020-10490-6