The Omicron variant of COVID-19 is intrinsically as severe as previous variants, unlike assumptions made in previous studies that it was more transmissible but less severe, a large study in the United States has found.

Omicron as severe as previous Covid variants, large study finds

New Omicron variants can cause a fresh wave of the Covid pandemic, a study has said. The new variants have been able to bypass natural immunity from prior COVID-19 infections, the study conducted in South Africa added.

Omicron Covid subvariants can overcome natural immunity, trigger new wave: Study

Do you know someone who has never been infected with coronavirus since the beginning of the pandemic? How did some health professionals avoid falling ill despite daily contact with Covid-19 patients? A study by Sweden's University of Gothenburg may provide some clues.

Hidden immunity: Study gives clues on how some escape Covid-19 infection

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