The immune system of some people is able to recognize part of the new coronavirus, even if he never fought again, a conundrum which could be explained by the circulation of cold commonplace, according to a study.
Among 68 participants in the health in which the blood has been analyzed by researchers in Germany, the third party had immune cells that react to fragments of SARS-CoV-2 in the laboratory. And, even if they have never caught the COVID-19.
A ” surprise “
The scientists, affiliated in particular to the university hospital of the Berlin Charité, admit that this discovery was a “surprise” for them.
The immune cells are T helper cells, white blood cells sometimes called T-helper or TCD4 that play an important role in the regulation of the immune response of the human body.
According to the researchers, “the probable reason is that the SARS-CoV-2 shares some structural similarities with coronaviruses, which are responsible for colds common”.
It is estimated that four coronaviruses are responsible for approximately 15% to 30% of colds are common, which are generally without danger.
This would mean that some of the participants in the study had contracted in the past one of these colds, and that their immune system had kept in memory of the information about them in order to better combat them in the event of a second infection.
As the new coronavirus is from the same family – although much more complex and virulent, the cells “T-helper” would also be recognized in part.