The virus killed at least 20 million people, wiped at least $10 trillion from the global economy and upended billions of lives.

Vaccination reduced SARS-CoV-2 transmission rates in schools, although less so for omicron than delta variants. Despite higher community-based transmission rates, in-school transmission remained low ...

Background: A third mRNA vaccine booster is recommended to improve immunity against SARS-CoV-2 in kidney transplant recipients (KTRs). However, the immunity against SARS-CoV-2 Ancestral strain and ...

In our study, patients infected with the Delta variant in 2021 and the Omicron variant of the present outbreak were compared to explore differences in clinical characteristics to better understand the ...

This phenomenon of less severe outcomes in hospitalized COVID-19 with Omicron has been noted in other reports with one study highlighting that Omicron has difficulty multiplying in the lungs compared ...

The omicron variant, though more transmissible, was thought to be less deadly than delta. But in some states, omicron caused more deaths than delta.

The study also found that patients with omicron who required hospitalization showed a similar need for supplemental oxygen and intensive care as hospitalized patients with delta. For patients with ...

New research suggests that the children younger than age 5 who are infected with the COVID-19 Omicron variant have less risk of severe health outcomes than those infected with the Delta variant.

The findings show that the Omicron variant is 6-8 times more infectious than the Delta variant. The severe clinical outcomes ranged from a 16% lower risk for emergency room visits to 85% less risk ...

Delta-omicron recombinant virus no reason for panic, health experts say The hybrid virus is rare, and data on spread and disease severity is not concerning.