An antibody test conducted by King George's Medical University (KGMU) on 989 KGMU health workers and about 500 plasma donors found that antibodies produced after vaccination are stronger and longer lasting than those produced after infection. Antibodies are destroyed in less than four months.
The study further found that herd immunity, which can break the chain of the virus, is not achieved through the natural transmission of infection but only through mass vaccination.
In the two-part study, 989 healthcare workers included Class IV staff, including junior doctors, staff, and senior faculty members, of whom 869 (88%) had antibodies. Of the 869, about 73% of employees had taken both doses of the vaccine and 13% had taken only one. The rest were people who had not been vaccinated but had contracted the COVID-19 infection in the past few months.
About 61 health workers did not develop enough antibodies despite taking both doses of the vaccine. Similarly, 25 workers had taken supplements but had not developed antibodies. The rest of the people who lacked antibodies had not yet been vaccinated.
However, from 14 days to three months after recovery, only 50% of the 500 plasma donors who came for the donation were found to have enough antibodies. In these donors, antibodies were either exhausted in time or the body did not produce enough. This may be due to low immunity or a less severe infection.
Professor Tulika Chandra, Head of the Department of Transfusion Medicine, says, “This indicates the possibility of developing enough antibodies, which is longer through vaccination than to acquire the infection naturally. The higher percentage of antibodies through the vaccine. There is a good sign, which indicates that the vaccine can achieve herd immunity."
"Usually when a person is infected, their body's memory cells store this information. So, even if antibodies have reached the information, it is believed that memory cells can fight off a repeat attack of that infection." However, in the second wave of Kovid-19, in many cases, people were seen to be re-infected, after which scientists believe that memory cells are not working properly against Kovid infection.
These are the initial results of the research. We aim to test 4000 samples to get better results.