A certain mutation in the COVID-19 Delta variant causes infected cells to form disruptive chunks in the lungs and leads to more serious symptoms of the disease, a research team said. If the cells ...

The Omicron variant of the coronavirus is suspected to be the most infectious yet by binding to human receptors better than the Delta variant and the team’s findings show it may have the potential to ...

Cases and hospitalizations related to the Omicron variant may be falling in the United States, but it is a different story in South Korea. COVID-19 infections there remained above 50,000..

Delta variant: First identified in late 2020 ... Fatigue: Excessive tiredness remains a hallmark symptom. Gastrointestinal problems: Nausea, stomach discomfort and diarrhea can occur in some ...