Errors in the results of coronavirus tests are due to errors made by both the medical staff and the patients themselves.According to RBK, representatives of Russian laboratories came to this conclusion after long-term research.It is reported that the Ministry of Health recommends taking biomaterial from the pharynx and nasopharynx. If a nurse takes a test on just one of these, you are more likely to get the wrong answer.In addition, the sterility of the probes and sample containers for smearing is also important.The patient should also be prepared for the procedure: do not eat, drink, brush your teeth, rinse your mouth or chew gum for an hour before taking the ointment.It is also forbidden to wash your nose or pour medicine.