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Will Omicron be more contagious than Delta? A virus evolution expert explains what researchers know and what they don’t.5 min read
It’s too early to say whether the newly identified Omicron variant is going to overtake Delta. But particular mutations in the new strain have researchers deeply concerned.
Beset by delays, this vaccine is becoming available when low-income countries are desperately short of doses.
Pfizer contractor Ventavia denies accusations of scientific misconduct on COVID vaccine trial.
Cases are high in people over 60, who are far more likely to develop severe COVID and need hospital treatment.