RT journal article T1 Immunoassay for SARS-CoV-2 Humoral Response Monitorization: A Study of the Antibody Response in COVID-19 Patients with Different Clinical Profiles during the First and Second Waves in Cadiz, Spain A1 Olvera Collantes, Lucía A1 Moares Fernández, Noelia del Carmen A1 Fernández Cisnal, R. A1 Muñoz Miranda, Juan Pedro A1 González García, Pablo A1 Gabucio López, Antonio A1 Freyre Carrillo, Carolina A1 Jordan-Chaves, Juan de Dios A1 Trujillo-Soto, Teresa A1 Rodriguez-Martinez, María P. A1 Martin-Rubio, Maria I. A1 Escuer, Eva A1 Rodríguez Iglesias, Manuel Antonio A1 Fernández Ponce, Cecilia Matilde A1 García Cózar, Francisco José A2 BiomedicinaBiotecnología y Salud Pública K1 SARS-CoV-2 K1 COVID-19 K1 antibody response K1 IgG antibodies K1 multiplex immunoassay K1 monitoring tool AB There is still a long way ahead regarding the COVID-19 pandemic, since emerging wavesremain a daunting challenge to the healthcare system. For this reason, the development of newpreventive tools and therapeutic strategies to deal with the disease have been necessary, amongwhich serological assays have played a key role in the control of COVID-19 outbreaks and vaccinedevelopment. Here, we have developed and evaluated an immunoassay capable of simultaneouslydetecting multiple IgG antibodies against different SARS-CoV-2 antigens through the use of Bio-PlexTM technology. Additionally, we have analyzed the antibody response in COVID-19 patients withdifferent clinical profiles in Cadiz, Spain. The multiplex immunoassay presented is a high-throughputand robust immune response monitoring tool capable of concurrently detecting anti-S1, anti-NCand anti-RBD IgG antibodies in serum with a very high sensitivity (94.34–97.96%) and specificity(91.84–100%). Therefore, the immunoassay proposed herein may be a useful monitoring tool forindividual humoral immunity against SARS-CoV-2, as well as for epidemiological surveillance.In addition, we show the values of antibodies against multiple SARS-CoV-2 antigens and theircorrelation with the different clinical profiles of unvaccinated COVID-19 patients in Cadiz, Spain,during the first and second waves of the pandemic. PB MDPI SN 2076-2607 YR 2023 FD 2023-12-16 LK http://hdl.handle.net/10498/30371 UL http://hdl.handle.net/10498/30371 LA eng NO Project grant number COV20-00173 of the 2020 Emergency Call for Research Projects about the SARS-CoV-2 virus and the COVID-19 disease of the Institute of Health “Carlos III” from the Spanish Ministry of Science and Innovation; Project grant number PECART-0096-2020, Consejería de Salud y Familias, Junta de Andalucía, Spain. DS Repositorio Institucional de la Universidad de Cádiz RD 07-nov-2026