Invitro disclosed the proportion of positive antibody tests in May

In May, the average daily number of positive tests for antibodies to CORONAVIRUS in RUSSIA exceeded 60%. This was reported to RBC by the medical company Invitro.

“According to the results of May 2021, the average daily number of patients of the medical company Invitro who received positive test results for class G antibodies (IgG) to the SARS-CoV-2 coronavirus infection in Russia amounted to 60.5%,” the report says.

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The results of both qualitative and quantitative tests for class G antibodies were taken into account. Invitro began mass testing for these antibodies in May 2020. According to the company, between 5,000 and 10,000 tests are performed daily. In total, the company has already conducted more than 2.4 million such studies. “The total number of positive results for class G antibodies to the SARS-CoV-2 virus cumulatively exceeded 36% across Russia,” the company said.

According to the organization, the growth of positive tests in Russia "indirectly indicates the formation of an immune response to this infection in a part of the population."

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At the same time, Andrey Pozdnyakov, an infectious disease specialist, chief physician of Invitro-Sibir LLC, called the results obtained insufficient. “Of course, the increase in the proportion of positive IgG results to SARS-CoV-2 cannot but rejoice <...> However, the cumulative total (36% of positive results in Russia) is clearly an insufficient figure. According to all, even preliminary data , people vaccinated against it in the population should be at least 70%, and in large cities, with a high proportion of the young population and dynamic in internal migration, more than 80%, ”he explained.

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More than 480,000 tests have been performed in Moscow since May 2020. Of these, positive results were obtained cumulatively in 28.7% of people who completed the study. The average daily number of positive results for May 2021 is 60.9%. For comparison: in March this figure did not exceed 40%.

Over the same period, more than 193,000 tests were performed in St. Petersburg , with positive results cumulatively obtained in 35.6% of cases. The average daily number of positive results in the last month was 59.5%. According to the results of March of this year, this figure did not exceed 36% of positive results from the total number of studies performed.

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Antibody tests use venous serum. Laboratory studies for the qualitative and quantitative determination of antibodies are carried out by enzyme immunoassay (ELISA) and immunochemiluminescent (ICLA) analysis. A positive IgG test indicates that a person has been infected with the coronavirus in the past or has been vaccinated against COVID-19. Antibodies can protect against recurrence or reduce its course.

Earlier, scientists from the Mount Sinai Medical Center in New York announced that the level of antibodies to coronavirus in people who had a mild or moderate infection, on average, remained about five months. The researchers recorded a particularly rapid drop in antibody levels in those who had asymptomatic COVID-19.

Scientists from the Medical University of Innsbruck in Austria have found that immunity in those who have been ill with coronavirus lasts at least eight months.

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