Originally published: News Medical, 02 February 2022
Due to the emergence of several severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern, vaccine-induced immunity to protect against severe coronavirus disease (COVID-19) has been found to wane over time. As a result, many countries around the world have mandated COVID-19 booster shots, which has rapidly increased the demand for vaccines.
A total of 1,222 patients who had received two doses of either the AstraZeneca or Pfizer COVID-19 vaccines were recruited to participate in the current study through Pureprofile, which is an international recruitment service, between October 27, 2021, and November 8, 2021. The median range of the study population was 52.5 years.