She stressed that modern test systems demonstrate high accuracy.
“However, negative responses are also possible (even with symptoms similar to COVID-19).
The reasons for this may be the following: a small viral load (a small amount of virus in the biomaterial), late stages of the disease (the virus has already “descended” into the lungs from the upper respiratory tract), the human factor (violations during the collection of biological material) ", - RIA Novosti quotes her ...
Tivanova noted that to confirm or exclude the presence of coronavirus, a second test should be done 10 days after the initial swab.
She also recalled that there is an indirect research method - testing for antibodies to coronavirus.
“IgMs are produced at the very beginning of the disease, they usually appear 3-5 days after the first symptoms appear and indicate an ongoing acute illness - a current infection.
IgGs appear when a person has overcome the infection, usually 10-14 days after the onset of the disease and remain long enough after the disease, "Tivanova explained.
Earlier, the head of the scientific center for molecular genetic research at DNKOM, Andrey Isaev, in an interview with kp.r, commented on the likelihood of re-contracting coronavirus infection.