‘The Higher the Number of Vaccines Previously Received, the Higher the Risk of Contracting COVID-19’: New Peer-Reviewed Study in ‘Open Forum Infectious Diseases’

The study also found that the effectiveness of the Pfizer and Moderna vaccines was only 29% during the omicron BA.4 and BA.5 variant phases, 20% during the BQ-dominant phase, and 4% during the XBB-dominant phase.