A study by Sri Jayadeva Institute of Cardiovascular Sciences and Research has noted that the COVID-19 antibodies were intact in 99% of the cohort, 6 months following the second dose of Covishield vaccine.

Director of the institute, Dr CN Manjunath, said that among 250 fully vaccinated healthcare workers, 99% of them were found to have intact antibodies against COVID-19. He added that the findings indicate that booster doses are not needed at present. Blood tests for the IgG neutralizing antibody were conducted on 250 healthcare workers at the hospital. All the participants had received their second dose of Covishield in February 2021. When tested for antibodies in April, 79% had a positive antibody response, while 21% exhibited a negative immune response. When tested in September, 99% of the cohort exhibited a positive immune response while only 1% had a negative immune response. Around 49% of the cohort had over 90% antibody levels… (ET Healthworld – TNN, September 25, 2021)