1. Study finds Omicron variant could break through vaccine protection more effectively than the Delta variant  News-Medical.Net
  2. Booster dose of BNT162b2 after two doses of CoronaVac improves neutralization of SARS-CoV-2 Omicron variant | Communications Medicine  Nature.com
  3. Study compares protection induced by Delta breakthrough infections vs. COVID boosters against Omicron  News-Medical.Net
  4. 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 | Scientific Reports  Nature.com
  5. Breakthrough infection with pre-Omicron variant induces cross-neutralizing activity against Omicron  News-Medical.Net
  6. View Full coverage on Google News

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