A study by the African Health Research Institute (AHRI) has found that the less of immune protection was “extensive but incomplete,” meaning that some level of immunity was retained against the vaccine.
Similar studies conducted by the AHRI also raised concerns about evasion of protection by the Beta variant of SARS-CoV-2, but the latest tests with Omicron “show much more extensive escape,” according to the researchers.
The study was carried out in 14 plasma samples from 12 patients who had been vaccinated with Comirnaty, and tested the ability of the plasma to neutralise Omicron.
