In people who have undergone coronavirus, the number of antibodies slowly decreases in the first six months, and then remains at the same level for 15 months. Such data showed the results of a study conducted in Sweden and Italy. An article by scientists was published on the site bioRxiv.org…
In the study, the scientists used data from 136 patients who suffered from coronavirus in various forms. Plasma titers of anti-S and anti-RBD antibodies were measured in volunteers. It is known that mutations accumulate in the structure of the S-protein and RBD-domain over time – they reduce the neutralizing ability of antibodies.
The study showed that at first the levels of IgM and IgA to S-protein were at 88% and 90%, and then decreased by half within 50 days. By the end of the sixth month after recovery, antibody titers had decreased fourfold from initial values. The high level of antibodies remained for longer in those who had been ill with COVID-19 in a severe form.
Experts also tested the effectiveness of antibodies to various strains of coronavirus. They found that antibodies are able to fight virus mutations even 15 months after illness, but not so actively.
Earlier that day, the Russian Direct Investment Fund (RDIF) said that the effectiveness of the Russian single-component vaccine against the Sputnik Light coronavirus against the Delta strain is 70% within three months.
At the same time, the use of “Sputnik Light” as a booster with the introduction of other vaccines before this gives an efficiency of up to 83% against the “Delta” strain.
Earlier, on September 27, the RDIF reported that the combination of the Russian Sputnik Light vaccine and the preparation of the Anglo-Swedish company AstraZeneca caused a fourfold increase in the number of antibodies to the S-protein of the coronavirus. An interim analysis showed that antibodies to the S-protein of the coronavirus are produced in 100% of the volunteers.
Large-scale vaccination is ongoing in Russia. The vaccination is given free of charge to everyone. Earlier, five drugs for coronavirus were registered in the country: Sputnik V, which became the first vaccine against COVID-19 in the Russian Federation and the world, Sputnik Light, EpiVacCorona, KoviVak and EpiVacCorona-N.
All relevant information on the situation with the coronavirus is available on the websites stopcoronavirus.rf and access to all.rf, as well as by the hashtag #WeVeTogether. Coronavirus hotline: 8 (800) 2000-112.