Determination of class G antibodies to SARS-CoV2 after application of ‘GamCOVID-Vac’ or ‘Sputnik V’ vaccine of National Research Centre for Epidemiology and Microbiology n.a. honorary academician N.F. Gamaleya

Abstract

We conducted a laboratory examination of 83 people after vaccination against the new coronavirus with the use of the ‘Gam-COVID-Vac’ vaccine of National Research Centre for Epidemiology and Microbiology n.a. honorary academician N.F. Gamaleya (Moscow, Russia), in order to determine the presence of post-vaccination class G antibodies to SARS-CoV-2. The reagent system ‘SARS-CoV-2-IgG – ELISA-BEST’ (Vector-Best Co., Novosibirsk, Russia) was used. According to the manufacturer, the reagent system detects a pool of class G immunoglobulins synthesized to all antigenic determinants of protein S, including the RBD domain, which ensures the specificity of this method for assessing the post-vaccination immune response. The study involved 36 men and 47 women, with an average age of 48.40 ± 1.15 years. An interim analysis of the blood serum of 51 participants 21 days after the first dose of the vaccine showed the presence of IgG antibodies to SARS-CoV-2 in 45 (88.24%) people. After 42 days, all 83 (100%) people were found to have IgG antibodies to SARS-CoV-2 virus. It is advisable to continue the study to assess the dynamics of the level of postvaccinal antibodies for 6 months.