This was reported by RBC.

It is noted that it is prescribed to take biomaterial from the oropharynx and nasopharynx, in the case of taking material only from the oropharynx or from the nose, a false result is possible.

Before taking a sample, you should treat your hands with an antiseptic.

Also, when taking a smear, the sterility of the probes is important.

Earlier, British doctors found that a lack of vitamin D may be the cause of a more severe course of coronavirus.