The REACT (Real-Time Assessment of Community Transmission) study involved 365,000 randomly selected adults of all ages. They carried out three times at home express testing for antibodies to the SARS-CoV-2 coronavirus using a blood sample from a finger.
As a result, the scientists found that the number of people with antibodies dropped by 26% after weakening the isolation measures.
It is noted that antibodies disappear especially quickly in those who have had COVID-19 asymptomatic and in the elderly. In persons from the age group of 18-24 years old, antibodies persisted much longer than in the group of 75 years and older.
The concept of herd immunity has been proposed by some scientists as a better alternative to strict restrictions. This approach would require about 50-60% of the population to be protected from the virus so that it can no longer be transmitted effectively.
This very large study found that the proportion of people with detectable antibodies declined over time.
Helen Ward, first article author, and professor
Therefore, a positive result for antibodies at the moment does not mean that immunity to COVID-19 will remain the next time you come into contact with the virus.