As the United States wrapped up 2025, the Centers for Disease Control and Prevention (CDC) released data showing a notable increase in respiratory illnesses across the country. The CDC’s latest respiratory virus surveillance report, published December 30, revealed elevated levels of influenza, respiratory syncytial virus (RSV), and to a lesser extent, COVID-19. The findings point to a challenging winter season for public health officials, hospitals, and families alike, as multiple respiratory viruses circulate simultaneously at significant levels.
Influenza activity was particularly prominent in many parts of the country. According to the CDC, a growing number of states are reporting high flu case counts, and the percentage of clinical visits for influenza-like illness is climbing. The rise in flu cases has led to increased emergency room visits and hospitalizations, especially among young children, the elderly, and individuals with underlying health conditions. Medical professionals across the nation have noted a surge in patient loads at hospitals and clinics, with some regions reporting pressures on bed availability and staffing.
The 2025–2026 flu season has so far been dominated by the H3N2 subtype of influenza A, which tends to cause more severe illness than other strains. While this year’s flu vaccine offers some protection, public health experts acknowledge that its effectiveness may be slightly reduced due to a partial mismatch with circulating variants. Nevertheless, vaccination remains the most effective tool in preventing serious outcomes, and health officials continue to urge all eligible Americans to get vaccinated.
RSV, a virus that primarily affects infants and older adults, has also remained elevated in recent weeks. Pediatric hospitals have reported increased admissions due to RSV infections, with some facilities approaching capacity. RSV is particularly dangerous for very young children, especially those under two years old, as it can lead to bronchiolitis and pneumonia. Several states have noted regional outbreaks, prompting concern among pediatric health care providers and parents alike. Efforts to increase awareness of RSV symptoms and the availability of preventive treatments for high-risk infants have become a priority in the public health response.
COVID-19, while not as dominant a presence as in prior winters, has shown signs of a slight uptick in certain regions. Wastewater surveillance and lab-confirmed case data indicate a modest increase in SARS-CoV-2 activity, though current levels remain significantly lower than past seasonal surges. Hospitalizations and deaths related to COVID-19 have remained relatively stable, but public health officials are watching for any signs of new variants that could alter the trajectory of the virus in early 2026.
Health experts attribute the increase in respiratory illnesses to seasonal factors, including colder weather that drives people indoors, where viruses can spread more easily. The holiday season, with its increased travel and gatherings, is also believed to have contributed to transmission. The CDC has reminded the public that while elevated respiratory virus activity is expected during winter months, prevention strategies can help mitigate risk. These include staying home when sick, practicing good hand hygiene, improving indoor air quality, and wearing masks in crowded or high-risk environments.
Vaccination remains a central focus of the CDC’s guidance. The agency recommends flu shots for everyone six months and older, COVID-19 boosters for eligible individuals, and RSV immunizations for certain age groups, including infants and older adults. In particular, new monoclonal antibody treatments for infants and RSV vaccines for seniors have been introduced in recent months and are expected to play a role in reducing severe outcomes.
Across the country, public health departments are coordinating with hospitals to manage capacity and ensure that vulnerable populations receive timely care. Local officials are also ramping up public messaging to encourage testing, early treatment for flu and COVID-19, and the use of preventive tools like masks and air purifiers in homes and schools. Some jurisdictions have reopened temporary clinics or telehealth services to expand access to respiratory illness care.
As the winter progresses, health authorities expect continued elevated activity of influenza and RSV into early 2026. While COVID-19 trends remain comparatively mild, the simultaneous circulation of three major respiratory viruses poses ongoing challenges. The CDC continues to monitor national data and work with state and local partners to support response efforts, emphasizing that layered prevention strategies remain key to navigating the respiratory virus season safely.
With the new year underway, the United States enters 2026 facing a familiar yet evolving public health landscape—one shaped by lessons from recent years and the persistent need for vigilance, preparedness, and informed decision-making in the face of seasonal illness.
