Delta vs. Omicron: Which COVID-19 variant will become dominant in the US? - The Boston Globe

Two key issues will determine the fate of Omicron: how transmissible it is and how well it evades the body’s immune system.

Clinical severity of, and effectiveness of mRNA vaccines against, covid-19 from omicron, delta, and alpha SARS-CoV-2 variants in the United States: prospective observational study

mRNA-based COVID-19 vaccine boosters induce neutralizing immunity against SARS-CoV-2 Omicron variant - ScienceDirect

Symptom prevalence, duration, and risk of hospital admission in individuals infected with SARS-CoV-2 during periods of omicron and delta variant dominance: a prospective observational study from the ZOE COVID Study - The

December 2021: Coronavirus Blog Archive

Tracking SARS-CoV-2 Omicron diverse spike gene mutations identifies multiple inter-variant recombination events

Symptom prevalence, duration, and risk of hospital admission in individuals infected with SARS-CoV-2 during periods of omicron and delta variant dominance: a prospective observational study from the ZOE COVID Study - The

COVID-19: Moderna's bivalent vaccine more effective against variants

The new subtype BA.2.75 & the Global Epidemic of COVID-19

How Omicron Symptoms Differ From Delta, Past COVID-19 Variants: Charts

What omicron's fast spread could mean for the U.S. – and the world

Omicron drives U.S. virus cases past delta's peak

Use of At-Home COVID-19 Tests — United States, August 23, 2021–March 12, 2022

COVID-19 due to the B.1.617.2 (Delta) variant compared to B.1.1.7 (Alpha) variant of SARS-CoV-2: a prospective observational cohort study

COVID-19 Omicron subvariant rapidly spreads across the U.S. - CBS News

Tracking Omicron and Other Coronavirus Variants - The New York Times