The portal medRxiv writes about it.

As researchers from the University of Southern California found out, traces of the virus remained in the bodies of three patients for more than six months.

We are talking about a young man, as well as a boy and a girl of preschool age.

It is noted that people with compromised immune systems are very vulnerable to coronavirus infection.

Earlier, American scientists found that people with the second blood group have a greater risk of contracting coronavirus infection.