A quartet of respiratory and gastrointestinal illnesses—including flu, COVID-19, RSV (respiratory syncytial virus), and norovirus—is surging across the U.S., leaving millions with coughing, aches, and stomach discomfort. Known as the “quad-emic,” this latest wave combines four viruses that typically peak in the fall and winter months. Recent CDC data shows emergency room visits for flu and RSV are at their highest levels in years, while norovirus cases are also climbing sharply. Dr. William Schaffner notes that this year’s increase could be due to more indoor gatherings or a new virus strain.
Age-related factors raise significant risks for severe complications from these illnesses. Older adults, who often have weakened immune systems and chronic health issues, face higher risks of respiratory distress (e.g., trouble breathing), chest pain, dizziness, confusion, and heart failure. Additionally, norovirus can cause dehydration in older people, further increasing their vulnerability to complications.
Edward Liu, MD, points out that weakness from norovirus-related symptoms—like nausea and vomiting—can also raise the risk of falls among older adults, who are already more susceptible to injuries as they age. With millions still vaccinated but boosted immunity waning, now is a critical time to stay informed about these outbreaks and take precautions.
Source: https://www.aarp.org/health/conditions-treatments/info-2025/flu-covid-rsv-norovirus-quademic.html