Natural immunity scores big & WON again! Chemaitelly et al.: “Duration of immune protection of SARS-CoV-2 natural infection against reinfection in Qatar”; pre-print

Sept 26, 2022

Effectiveness of primary infection against severe, critical, or fatal COVID-19 reinfection was 97.3% (95% CI: 94.9- 98.6%), irrespective of the variant of primary infection or reinfection, no waning