The level of antibodies to COVID-19 decreases fastest in young men, and it lasts better and longer in older people, while severe course, increased body weight and a high percentage of lung damage positively affect the immunity produced. This was found out during the study by experts of the Kirov Military Medical Academy and the Helix Laboratory Service. Scientists are inclined to believe that testosterone can suppress the production of antibodies. This is the second Russian study that confirms that immunity after the coronavirus lasts an average of six months, and after that most of the citizens need vaccination. Experts of the Helix Laboratory Service and the Kirov Military Medical Academy from June 1, 2020 to August 1, 2021, within the framework of the Response research project, observed changes in the level of specific antibodies (IgG) in people who had suffered COVID-19 of varying severity, including in asymptomatic form. In
