The reason for this is a cross-reaction: when helper T cells develop in response to another virus, they respond to a similar, but previously unknown pathogen.
Scientists have discovered in the body of some people who have never previously had COVID-19, auxiliary T cells that can recognize and respond to a dangerous virus. This is stated in a new study, the results of which on Thursday, June 4, published a Science alert.
Researchers believe that the reason for this is the so-called cross-reaction: when helper T cells develop in response to another virus, they respond to a similar, but previously unknown pathogen. In this case, T cells may remain after a person’s prior contact with another type of coronavirus — probably one of four that cause a cold.
According to scientists, these cells “can help generate a faster and stronger immune response.” Among the groups of coronavirus patients studied in this study, only two had severe cases. The remaining 90% had mild or moderate infection. However, some skeptics believe that it is too early to draw conclusions that the cross-reaction plays a role in exactly how COVID-19 proceeds in the human body. Indeed, for several months, the data may be irrelevant due to the rapid mutation of the virus.
However, the authors of the study note that “the immune system is associated with the event. If it is a strong event, you will have a strong memory.”