A high level of interferon can make a person "invulnerable" to coronavirus, Toptygina said in an interview with Moskovsky Komsomolets. According to her, interference, that is, an interaction in which infection with one disease prevents the development of another, can also cause immunity to coronavirus. For example, in response to ARVI, the body produces interferon, to which the coronavirus is sensitive, so the development of COVID-19 in the body is inhibited.
"People with a high ability to produce our innate defense - interferon - can fight off a viral attack. In addition, there is such a thing as cross-immunity, when a person's protection against a certain virus or bacteria saves from another," - explained the principle of immunity Toptygin.
The doctor also compared the natural immunity and the immunity developed after vaccination. According to her, the strength of the immune response depends on the duration of the infection in the body. Over time, the production of S antigen decreases. In this case, a vaccine will help, which can prolong the production of antibodies.