Respiratory Syncytial Virus (RSV) is a common virus that affects the respiratory tract and lungs. Though most people recover from RSV within a week or two, the virus can be serious—especially for infants, young children, older adults, and individuals with weakened immune systems. In recent years, awareness around RSV has increased due to rising hospitalization rates in pediatric units and seasonal outbreaks.
Knowing the symptoms of RSV and how they vary between age groups is essential for timely intervention and care. This article provides a detailed overview of RSV symptoms, how they progress, when to seek medical help, and how the virus differs from similar respiratory infections.
What Is RSV?
RSV is a highly contagious virus that spreads through respiratory droplets. It commonly circulates during the fall and winter months and is one of the leading causes of bronchiolitis (inflammation of the small airways in the lung) and pneumonia in children under one year old.
While RSV typically starts like a mild cold, it can escalate into a serious illness requiring hospitalization, particularly in infants and the elderly. According to the CDC, nearly all children are infected with RSV by their second birthday.
Common RSV Symptoms
1. Initial Symptoms (Early Stage)
RSV usually starts with symptoms similar to the common cold. These early signs can include:
- Runny nose
- Sneezing
- Mild cough
- Low-grade fever
- Decreased appetite
- Fatigue or irritability (especially in infants)
These symptoms often appear 4 to 6 days after exposure and are usually mild in healthy individuals. However, RSV symptoms can worsen quickly in vulnerable populations.
RSV Symptoms in Infants
Infants—especially those under 6 months—may not show typical cold symptoms. Instead, their RSV symptoms may be subtle or resemble more severe illnesses.
Key Signs in Infants:
- Rapid, shallow breathing: You might see chest muscles pulling inward during breathing.
- Persistent coughing: Often wet-sounding or deep.
- Wheezing: A high-pitched whistling sound while breathing.
- Nasal flaring: Widening of the nostrils while breathing, a sign of respiratory distress.
- Blue-tinged skin or lips: Due to insufficient oxygen.
- Poor feeding: Refusing to eat or trouble sucking/swallowing.
- Unusual fatigue or irritability: Babies may seem excessively sleepy or cranky.
Infants are more susceptible to RSV-related complications such as bronchiolitis and pneumonia, often requiring oxygen therapy or hospitalization for close monitoring.
RSV Symptoms in Toddlers and Children
Children aged 1 to 5 years usually exhibit more noticeable cold-like symptoms and can often recover at home. However, parents should still monitor for signs of worsening.
Symptoms in Children:
- Stuffy or runny nose
- Sore throat
- Persistent cough
- Sneezing
- Mild headache
- Fever (100.4°F / 38°C or higher)
- Decreased appetite or energy levels
- Wheezing or difficulty breathing (in more severe cases)
Children with asthma or chronic lung disease are at higher risk for complications and may experience more severe symptoms during an RSV infection.