Academician of the Russian Academy of Sciences Areg Totolyan said that about 15-20% of those who have had coronavirus lose their antibodies within a couple of months. "Approximately 15-20% of those who have been ill lose antibodies: the immune system somehow reacted with a small level of antibodies, and after a month, one and a half, two of these antibodies not even a trace remained," Totolyan said on the air of the Russia 1 TV channel. Earlier, biophysicist, leading specialist of the Vaktsina.ru project, Nelly Sosedova, said that it is possible to identify the asymptomatic course of coronavirus with symptoms such as a short-term loss of smell and a change in taste. She also advised in this case to do a quick test for antibodies - immunochromatographic. Over the past day, 15,099 new cases of coronavirus have been detected in Russia. Clinical manifestations of the disease were absent in 3,996 (26.5 percent) people. Moscow accounted for 4,610 new cases. The smallest number of cases is observed in the Chuvash Republic - 44, Tatarstan - 41, the Jewish Autonomous Region - 30, the Nenets Autonomous Okrug - 8, the Chechen Republic - 6. In total, 1 299 334 cases of COVID-19 were recorded in the country in 85 regions.