Cold and Flu

Winter Quad-Demic: 4 Common Viruses Explained

This winter, the United States is experiencing a surge of four major viruses simultaneously, often called a "quad-demic." These include COVID-19, influenza (flu), respiratory syncytial virus (RSV), and norovirus, all contributing to increased illness and hospital visits across the country . While COVID-19 cases have peaked and are declining in many areas, emergency department visits and hospitalizations remain elevated due to these overlapping infections . Understanding these viruses, their symptoms, and how to prevent their spread is crucial for staying healthy during this challenging season .