Abstract
Coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, was first reported in Wuhan, China, in December 2019. Diagnostic methods for the detection of the virus and seroconversion of neutralizing antibodies (NAbs) in plasma have been developed specifically, but some of them require a BSL3 facility. In this study, we used the SARS-CoV-2 Surrogate Virus Neutralization Test Kit to determine the presence or absence of NAbs anti-receptor binding domain of the viral spike (S) glycoprotein in a BSL2 facility. The sample population was chosen in Quito, Ecuador, with a total of 88 COVID-19 positive convalescent patients. We determined that 97.7% of the analyzed convalescent sera maintained the presence of NAbs with neutralizing activity, and this activity remained until 10 months after the infection in some cases. In addition, the relationship between the presence of NAbs and immunoglobulin G was significant compared to immunoglobulin M, which tended to be absent over time.
Keywords: IgG; IgM; SARS-CoV-2; convalescence; neutralizing antibodies; plasma.
【저자키워드】 SARS-CoV-2, IgG, IgM, Neutralizing antibodies, convalescence, plasma., 【초록키워드】 COVID-19, coronavirus disease, neutralizing antibody, Coronavirus disease 2019, coronavirus, Neutralizing antibodies, Infection, Test, severe acute respiratory syndrome Coronavirus, virus, Neutralizing activity, Convalescent patients, Immunoglobulin G, Seroconversion, Viral, Immunoglobulin, neutralization test, Wuhan, convalescence, plasma, Neutralizing, glycoprotein, Ecuador, diagnostic methods, respiratory, convalescent sera, NAb, immunoglobulin M, in some, presence or absence, acute respiratory syndrome, acute respiratory syndrome coronavirus, acute respiratory syndrome coronavirus 2, NAbs, viral spike, binding domain, positive, BSL3, surrogate, BSL2 facility, Quito, Wuhan, China, analyzed, caused, reported, addition, remained, determine, absence, the SARS-CoV-2, 【제목키워드】 convalescent plasma, in vitro study, performed,