CDC director acknowledges that more than 75% of COVID deaths are people with multiple diseases

medRxiv Jan 6, 2022https://www.medrxiv.org/content/10.1101/2022.01.05.22268782v1BACKGROUND: Natural SARS-CoV-2 infection elicits strong protection against reinfection with the Alpha (B.1.1.7), Beta (B.1.351), and Delta (B.1.617.2) variants. However, the Omicron (B.1.1.529) variant harbors multiple mutations that can mediate immune evasion. We estimated effectiveness of prior infection in preventing reinfection (PES) with Omicron and other SARS-CoV-2 variants in Qatar.HIGHLIGHTS- Protection affor...