The duration of natural immunity in patients with covid has been determined
Scientists from Sweden and Italy conducted a study that showed that in the majority of patients with coronavirus in the first six months, antibodies gradually decreased, and then remained stable for up to 15 months.
Moreover, the high level of antibodies remained longer in people who had recovered in a severe form. The article was published on bioRxiv.org.
Experts measured the titers of anti-S and anti-RBD antibodies in the blood plasma of patients. The former target the S-protein of the coronavirus, while the latter target the receptor-binding domain (RBD) of the S-protein, which plays a key role in the binding of the virus to human cells.
In addition to the main strain, the authors tested the effectiveness of antibodies against beta, gamma and delta variants of the virus for up to 15 months after infection.
It turned out that the neutralizing activity of antibodies, albeit to a lesser extent, is preserved for these strains.
Meanwhile, against the background of an increase in the incidence of covid, experts talk about the need for revaccination, since after six months the antibody titer may be lower than is required to protect the body from infection. Read about the rules of revaccination and whether it is necessary to somehow prepare for it in the AiF article.