With the start of mass testing for antibodies to the new coronavirus infection, people have questions about the interpretation of their results. Elena Belova, an infectious disease specialist of the scientific and clinical department of the Moscow Center for the Prevention and Control of AIDS, told Vecherka what the test shows.
First of all, Elena Belova explained what the abbreviations IgM and IgG mean.
- Immunoglobulins (Ig) "M" and "G" are antibodies of the early and late phase, respectively. Immunoglobulins "M" begin to be produced on average at the end of the first week of illness. They indicate that the person has encountered an infection and is currently sick, - said the infectious disease doctor.
In this case, the disease can take place in different forms, in some cases - without symptoms. So even if a person feels well, and the test showed the presence of IgM, it means that he is sick.
Immunoglobulins "G" are so-called "memory" antibodies that begin to be produced after the second week of illness. With their help, the body reports that it has encountered a virus and understands how to deal with it.
It is possible that the test results will show the presence of both types of antibodies - for example, if a person is tested between the second and third weeks of illness.
“This suggests that the person did not fall ill today, that he has already been ill for more than a week and a half, and he begins to develop antibodies of" memory ", - said Elena Belova.
Another abbreviation that prompts questions from those who passed the test is KP. It stands for “coefficient of positivity”. This is a mathematically calculated value that is important only for specialists and is closely related to the concept of "reference values" (RZ). They are indicated on the form and may vary depending on the test system used. For example, there may be numbers from 1 to 10 - this means the range of the norm.
- If the value of antibodies falls within the P3 range, then there are no antibodies. For example, if the IgM and IgG values are less than one, then there are no antibodies. And this is normal, because the coronavirus is a new infection, says Elena Belova.
It makes no sense to do a test on the very first day of the onset of symptoms of the disease - the antibodies have not yet had time to develop. In the first week, even class "M" antibodies may not be enough to be detected by the test system. Therefore, at the very beginning of the disease, doctors are guided by the clinical picture of the disease, the results of the PCR test and, in difficult cases, by the results of computed tomography.
In late November - early December, the capital will start massively vaccinating against COVID-19. Manufacturers are preparing for its industrial production. Clinical trials of the vaccine started on September 7th. More than 20 thousand people have already been vaccinated against coronavirus in Moscow.