With the rise of omicron came the fall of long-lasting protection from reinfection with the pandemic coronavirus SARS-CoV-2, according to a study published in Nature. Using population-wide data from ...

Strain found in 29 states and Puerto Rico carries spike mutations, but no data shows increased severity Sign up for the Breaking News US email to get newsletter alerts in your inbox BA.3.2, an Omicron ...

Prior COVID-19 vaccination did not stop the immune system from mounting a protective response to the Delta and Omicron strains, though new mutation-specific antibody production dipped slightly, ...

A Stanford-led team has found two antibodies that can work together to defeat all SARS-CoV-2 variants. More research is needed, but the approach could help in the development of treatments to keep ...

A newly identified Covid-19 subvariant, BA.3.2, informally dubbed the "Cicada" variant, is drawing global attention after being detected in the United States and other regions. Emerging from the ...

In persons who had received the BNT162b2 vaccine in Qatar, the incidence of infection with the omicron variant after 35 days of observation was 2.4% among those who had received three doses and 4.5% ...