Previous research on coronavirus antibodies, proteins in the blood that protect the body from subsequent infections, has shown that they could fade within a few months.
However, many such studies have not taken into account the multilayered defense of our immune system against various attacks, more precisely, the role of white blood cells, which possess impressive memory power, is rejected. These blood cells help the body rise to a higher level in the fight against the virus.
A study published in the journal Cell suggests that anyone who receives Covid 19, even those with mild or completely asymptomatic symptoms, develops T cells in the body that identify and destroy infected cells and inform B cells about how to develop them. new antibodies. which will fight the virus.
These T cells can remain in the body for years, while the level of antibodies produced in the body falls over time after infection, reports Kliks.
The authors of this study analyzed the blood of 206 people in Sweden who had Covid-19 with a different clinical picture. They found that regardless of whether a person was recovering from a severe or mild case, they did develop strong T cells capable of responding to subsequent attacks of the virus. Several other similar optimistic studies have been conducted recently.
A study published in July found that in a group of 36 recovering patients, they all produced memory T cells. In Germany, scientists found that 80 percent of patients in the study developed T-cell-specific T cells.
Interestingly, even people who have never been exposed to the coronavirus can have protective T cells. Scientists see the explanation for these results in a phenomenon called cross-reactivity – T cells probably come from previous exposure to some other coronaviruses, those that cause colds.
Although this T-cell news is promising, scientists still do not know exactly how long the coronavirus’s immunity lasts. The good thing is that after infection their number does not decrease as with antibodies, moreover, the study showed that T cells even increase three months after the symptoms of coronavirus.