In turn, the specificity of rapid tests was significantly higher than that of RT-PCR and was 66.3% (from 55.7 to 75.8%) and 67.4% (from 56.8% to 76.8%) for SGTI-flex COVID-19 Ag and Biocredit COVID-19 Ag versus 30.4% (from 21.3% to 40.9%) obtained for PCR. The gene discussed is RENBP; the disease is COVID-19.