American doctors described the first cases of "eternal" infection with coronavirus: in some patients, the virus persists for months or even longer.

According to medRxiv, experts from the University of Southern California recorded that traces of the virus remained in the bodies of several patients with leukemia for six months. This indicates that people with compromised immunity are vulnerable to disease.

According to experts, the prolonged presence of coronavirus in the body increases the chances that the virus, mutating, will eventually become invulnerable to antibodies.

Besides, due to weak immunity, such patients have a chance of being infected several times, and they cannot be cured for a long time.