Respiratory syncytial virus
Respiratory syncytial virus, or RSV, is a common virus that infects the airways and lungs. Most infections resemble a cold, but RSV can cause inflammation of the small airways or pneumonia. Babies, older adults, and people with certain health conditions are more likely to become seriously ill. Repeat infections can occur throughout life.
Prevention: Vaccine
Symptoms
- Runny or blocked nose and coughing
- Reduced appetite, fever, or wheezing
- In young babies, irritability, reduced activity, or breathing difficulties
Transmission
- Droplets released by coughing or sneezing
- Direct contact, such as kissing someone with RSV
- Touching a contaminated surface and then the eyes, nose, or mouth
Prevention
Wash hands, cover coughs, clean frequently touched surfaces, and improve indoor ventilation. Stay away from others when ill, especially vulnerable people. Immunization options are available for some groups; a healthcare professional can explain what applies locally.
Diagnosis and care
Most people recover with supportive care. Get medical advice if breathing is difficult, fluid intake is poor, or symptoms worsen. Severe illness may require hospital care and support for breathing or hydration.
Source
- About RSV
Based on CDC information
Source language: English
Source reviewed: December 19, 2025
Source accessed: May 17, 2026
- CDC: How RSV Spreads
Based on CDC information
Source language: English
Source accessed: October 7, 2026
- CDC: Symptoms and Care of RSV
Based on CDC information
Source language: English
Source accessed: October 7, 2026
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