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🩺 Medically reviewed by the Health Decoded Guide Editorial Team· Last reviewed: August 2026
🔍 Quick Summary
Respiratory syncytial virus (RSV) infection is a common viral infection that affects the nose, throat and lungs. It is one of the leading causes of bronchiolitis and pneumonia in infants and young children.
Most people recover with supportive care, but RSV can become serious in babies, older adults and people with weakened immune systems.
1️⃣ Introduction
RSV is a highly contagious virus that spreads easily from person to person.
• almost all children are infected with RSV by 2 years of age
• it usually causes cold-like symptoms in healthy children and adults
• some people develop severe lower respiratory tract infections
👉 Understanding who is most at risk helps families recognise when medical attention is needed.
2️⃣ How RSV affects the body
RSV enters the body through the nose, mouth or eyes and infects the lining of the airways.
• the virus causes inflammation and swelling of the airways
• mucus production increases
• the small airways may become blocked, especially in babies
👉 Narrow airways make it harder for babies and young children to breathe.
3️⃣ Types
Upper respiratory RSV infection
• mainly affects the nose and throat
• causes symptoms similar to the common cold
Lower respiratory RSV infection
• affects the lungs and smaller airways
• may cause bronchiolitis or pneumonia
👉 Although many infections are mild, lower airway disease can become serious in vulnerable people.
4️⃣ Common causes
Person-to-person spread
• coughing and sneezing
• close contact with an infected person
Contaminated surfaces
• touching toys, door handles or other objects
• touching the eyes, nose or mouth after contact
👉 RSV spreads very easily, especially in homes, schools and childcare centres.
5️⃣ Symptoms
• runny nose
• cough
• fever
• sneezing
• reduced appetite
• wheezing
• difficulty breathing in more severe cases
👉 In very young babies, poor feeding, irritability or pauses in breathing may be the first signs.
6️⃣ Associated symptoms or complications
• bronchiolitis
• pneumonia
• dehydration
• ear infection
• worsening of asthma or chronic lung disease
👉 These complications are more likely in infants, premature babies, older adults and people with weakened immune systems.
7️⃣ 🩺 When it becomes dangerous 🚨
• fast or difficult breathing
• ribs pulling in with each breath
• blue lips or fingertips
• poor feeding or signs of dehydration
• pauses in breathing (apnoea) in infants
• extreme sleepiness or difficulty waking
👉 These may indicate:
• severe RSV infection affecting the lungs
• need for urgent medical assessment
8️⃣ Management / treatment
• ensure adequate fluids and rest
• use fever-reducing medicines when appropriate
• clear nasal congestion with saline drops and gentle suction in babies
• oxygen or hospital care may be needed for severe illness
👉 Antibiotics do not treat RSV because it is caused by a virus.
9️⃣ Diagnosis
• medical history and physical examination
• nasal swab for RSV testing when needed
• oxygen level measurement
• chest X-ray only in selected cases
👉 Most healthy children do not need special tests because RSV is usually diagnosed based on symptoms and examination.
🟢 Important Message
RSV is very common and most people recover without complications.
👉 However, babies with breathing difficulties, poor feeding or unusual sleepiness should be assessed promptly by a healthcare professional.
FAQ
• Is RSV the same as the common cold?
No. RSV is a specific virus that can cause cold-like symptoms but may also lead to bronchiolitis or pneumonia.
• Can adults get RSV?
Yes. Adults can become infected, especially older adults and people with chronic medical conditions.
• Is RSV contagious?
Yes. It spreads easily through respiratory droplets and contaminated surfaces.
• Can RSV be prevented?
Good hand hygiene, avoiding close contact with sick people and protecting high-risk infants with recommended preventive measures can reduce the risk.
• Can someone get RSV more than once?
Yes. Previous RSV infection does not provide lifelong immunity, so people can get RSV again. However, repeat infections are often milder in healthy older children and adults.
🧠 Why We Delay
Many parents think RSV is "just another cold," especially because it often starts with a runny nose and mild cough. As a result, worsening breathing problems may not be recognised until the illness becomes more severe.
Most RSV infections improve on their own, but babies can become seriously unwell much more quickly than older children or adults. Watching for changes in breathing, feeding and alertness can help families know when to seek medical care.
👉 If a baby is working hard to breathe or feeding poorly, don't wait—seek medical assessment early.
🔗 Related Health Topics
• Bronchiolitis
• Pneumonia
• Asthma in Children
• Wheezing in Children
• Fever in Children
• Persistent cough in children
📚 Medical References
• National Health Service (NHS). Respiratory syncytial virus (RSV).
• Centers for Disease Control and Prevention (CDC). About RSV.
• World Health Organization (WHO). Respiratory syncytial virus (RSV).
• American Academy of Pediatrics (AAP). RSV: When It’s More Than Just a Cold.
• Mayo Clinic. Respiratory syncytial virus (RSV) – Symptoms and causes.
⚠️ Medical Disclaimer
This article is for educational purposes only and does not replace professional medical advice.
If you have concerning symptoms, risk factors or abnormal test results, consult a healthcare professional.