RSV
Based on CDC and WHO guidance, checked against those sources on Oct 12, 2026. Educational information only — not a diagnosis or a substitute for a licensed healthcare professional.
Common symptoms
- Runny nose
- Congestion
- Decreased appetite
- Coughing
- Sneezing
- Fever
- Wheezing
- In very young infants: irritability, decreased activity, or pauses in breathing — sometimes without fever
Symptoms usually start 4–6 days after infection. These symptoms can also be caused by other illnesses.
Seek emergency care for
- Trouble breathing, or pauses in breathing (apnea) in an infant
- Not drinking enough fluids (in babies, fewer wet diapers)
- Symptoms getting worse
- In adults: chest pain or pressure, sudden dizziness or confusion, or trouble eating or drinking
When to contact a healthcare professional
- If an infant has trouble feeding, fewer wet diapers, or is unusually sleepy.
- If an older adult or someone with heart or lung disease becomes short of breath.
- If symptoms worsen after the first few days.