Ziyad Al-Aly is chief of research and development at VA St. Louis Health Care System and a clinical epidemiologist at Washington University in St. Louis. From the very early days of the pandemic, ...

Yearly Covid-19 Booster Recommendations in Canada, Europe, and Australia. Although the rapid development of multiple Covid-19 vaccines in 2020 represents a major scientific, medical, and regulatory ...

Since May, highly contagious "FLiRT" coronavirus variants – a term for new mutations of Omicron – have been driving a rise in infections and emergency room trips. Virus levels at local wastewater ...

Soon after SARS-CoV-2 began its assault on the world, scientists began searching for clues about what, if any, factors made people more or less likely to get infected with the virus, and more or less ...

As much as we’d like to think that COVID-19 is behind us, the virus isn’t going anywhere. Health officials continue to recommend that people get vaccinated for both COVID-19 and influenza every year ...