What to Know About the 2025–2026 Respiratory Virus Season in the U.S.

Bottom line: COVID-19, influenza (flu), and respiratory syncytial virus (RSV) are continuing to circulate across the United States during the 2025–2026 respiratory virus season. Public health guidance from the Centers for Disease Control and Prevention (CDC) emphasizes vaccination, early testing for high-risk people, and staying home when sick as the most practical ways to reduce spread and serious illness.

What’s circulating right now?

Each fall and winter, the U.S. sees increased activity from several respiratory viruses. The main ones are:

Influenza (flu)
COVID-19
RSV (respiratory syncytial virus)

According to the CDC, these viruses can overlap in timing and symptoms, making it difficult to tell them apart without testing. While most people experience mild illness, some groups face a higher risk of hospitalization or complications.

Symptoms to watch for

Flu, COVID-19, and RSV can all cause:

Fever or chills
Cough
Sore throat
Runny or stuffy nose
Fatigue
Headache and muscle aches

COVID-19 may also cause loss of taste or smell, though this is less common than earlier in the pandemic. RSV in adults often looks like a mild cold, but in infants and older adults it can lead to wheezing, difficulty breathing, or pneumonia.

Seek urgent medical care for trouble breathing, chest pain, confusion, dehydration, or symptoms that rapidly worsen—especially in infants, older adults, pregnant people, or anyone with chronic conditions.

Who is at higher risk?

CDC guidance identifies several groups at higher risk for severe disease from respiratory viruses:

Adults 65 and older
Infants and young children (especially under 2 years for RSV)
Pregnant people
People with chronic conditions such as heart disease, lung disease, diabetes, obesity, kidney disease, or weakened immune systems

Residents of long-term care facilities and people with limited access to healthcare may also face higher risks due to exposure or delayed treatment.

Vaccines: What public health agencies recommend

The CDC recommends updated seasonal flu vaccination for everyone 6 months and older, unless medically contraindicated. Flu vaccines are updated annually to match circulating strains as closely as possible.

For COVID-19, the CDC recommends receiving the most recent updated vaccine formulation, particularly for older adults and people with risk factors for severe disease.

For RSV, preventive options have expanded in recent years. These include:

Maternal RSV vaccination during pregnancy to protect newborns
Monoclonal antibody protection for eligible infants
RSV vaccines for adults 60 and older, based on shared clinical decision-making

Guidance may evolve as new data become available, so checking CDC updates or speaking with a clinician is important.

How effective are these vaccines?

Vaccine effectiveness varies by virus, strain match, and individual health factors. Flu vaccine effectiveness can differ each season but consistently reduces the risk of severe illness, hospitalization, and death, even when it does not fully prevent infection.

Updated COVID-19 vaccines have been shown in real-world studies to reduce the risk of severe disease and hospitalization, especially among older adults. RSV prevention strategies have demonstrated strong protection against severe infant disease and lower respiratory tract disease in older adults in clinical trials, though long-term real-world data are still accumulating.

Like all medical interventions, vaccines are not perfect and do not eliminate risk entirely. However, they significantly lower the chance of severe outcomes.

Testing and treatment: Timing matters

Testing can help distinguish among viruses, especially for people at higher risk. Antiviral treatments for flu (such as oseltamivir) work best when started within 48 hours of symptom onset. Certain antiviral medications are also available for COVID-19, particularly for high-risk patients, and must be started early to be most effective.

RSV does not have a widely used outpatient antiviral treatment for adults, so supportive care—fluids, fever control, and monitoring breathing—is the main approach. In infants and high-risk individuals, early evaluation is important.

Practical prevention steps

CDC prevention guidance for respiratory viruses includes:

Stay home when sick and return to normal activities only after fever resolves and symptoms improve.
Wash hands regularly and avoid touching your face.
Improve indoor air quality with ventilation or filtration when possible.
Consider masking in crowded indoor settings, especially during surges or if you are high risk.
Keep up with recommended vaccinations.

These layered strategies are especially important in schools, workplaces, and multi-generational households.

What about schools and workplaces?

Schools and employers generally follow local and state public health guidance. Staying home while symptomatic remains a key measure to reduce spread. Families should check with their pediatrician or local health department for updated school exclusion policies.

For caregivers of older adults, particularly in nursing homes, vaccination and early testing after exposure are critical steps to prevent outbreaks.

Equity and access considerations

Access to vaccines, testing, and treatment can vary by insurance status, geography, and income. Vaccines for children are available through the federally funded Vaccines for Children program. Medicare covers recommended vaccines for eligible adults. Community health centers funded through the Health Resources and Services Administration (HRSA) may provide low-cost services for uninsured individuals.

If cost is a concern, checking Medicare.gov, HealthCare.gov, or a local health department website can help clarify options.

What remains uncertain?

Respiratory virus activity fluctuates year to year. Strain dominance, population immunity, and vaccine uptake all influence the severity of a given season. While public health agencies track hospitalization and mortality data in real time, exact projections for the rest of the season are uncertain.

Public health guidance may adjust if new variants emerge or if strain patterns shift.

What this means for readers

For most healthy adults, respiratory viruses will cause a temporary illness. For older adults, infants, and people with chronic health conditions, they can be more serious.

The most practical steps remain straightforward: stay up to date on recommended vaccines, test early if you are high risk and develop symptoms, seek care promptly if symptoms worsen, and take reasonable precautions during periods of increased transmission.

Checking CDC updates or your local health department website periodically can help you stay informed as the season continues.

This article is for general informational purposes only and is not medical advice. Research findings can be early, limited, or subject to change as new evidence emerges. For personal guidance, diagnosis, or treatment, consult a licensed clinician. For current outbreak or public health guidance, follow your local health department, the CDC, or another relevant public health authority.