The benefit of vaccination after previous SARS-CoV-2 infection in the omicron era
Understanding the durability of the protection conferred by SARS-CoV-2 infection and vaccination is of utmost importance to guide COVID-19 mitigation policies worldwide. In November, 2021, before the emergence of the omicron (B.1.1.529) variant, an estimated 3·8 billion people (44% of the global population) had been infected by SARS-CoV-2.1 This number is likely to have exponentially increased with the spread of the omicron variant, the most transmissible SARS-CoV-2 variant to date, suggesting that most of the global population has now already experienced SARS-CoV-2 infection at least once.
Source: thelancet.com