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What We Know About Omicron, BA.4 and BA.5 - The New York Times
Infectiousness of SARS-CoV-2 breakthrough infections and reinfections during the Omicron wave
Early Estimates of Updated 2023–2024 (Monovalent XBB.1.5) COVID-19 Vaccine Effectiveness Against Symptomatic SARS-CoV-2 Infection Attributable to Co-Circulating Omicron Variants Among Immunocompetent Adults — Increasing Community Access to Testing
What to Know about the New COVID Variant JN.1
Trying to Solve a Covid Mystery: Africa's Low Death Rates - The New York Times
COVID Vaccine Effectiveness, Available Treatments: What to Know About XBB.1.5 - CNET
What are the symptoms of the new COVID variant?
COVID-19 Cases and Hospitalizations by COVID-19 Vaccination Status and Previous COVID-19 Diagnosis — California and New York, May–November 2021
FDA vaccine advisers 'disappointed' and 'angry' that early data about new Covid-19 booster shot wasn't presented for review last year