RSV is a respiratory virus that affects the lungs and airways.

Symptoms can begin about 3 to 5 days after a person is first exposed to the virus.

Older children and adults usually present with symptoms similar to the common cold and symptoms go away in 1 to 2 weeks. Typical RSV symptoms include:

• Runny nose
• Cough
• Low grade fever (less than 38.5° C or 101° F)
• Loss of appetite
• Mild sore throat

In very young infants with RSV, the only symptoms may be irritability, decreased energy, and breathing difficulties.

Symptoms can worsen if the virus induces inflammation of the lungs. In the case of a more serious infection, symptoms could include:

• Difficulty breathing or rapid breathing
• Unusual or prolonged pauses of breathing
• Wheezing
• Difficulty feeding

RSV is highly contagious, meaning it spreads easily from person to person through breathing, coughing, and sneezing. The virus can also spread when a person touches tiny droplets from coughs, or sneezes on another person or on an object, and then touches their own mouth or nose before washing their hands.

People infected with RSV are usually contagious for 3 to 8 days. However, some people with compromised immune systems can continue to spread the virus even after their symptoms have ceased, for as long as 4 weeks.

In older children and healthy adults, illness is usually mild and may manifest only as a common cold. However, in some cases, RSV can cause more severe infections such as bronchiolitis, meaning inflammation of the small airways in the lungs, and pneumonia, an infection of the lungs.

Premature children, children younger than 6 months, children with chronic respiratory or cardiac conditions, older adults, and patients who are immunocompromised are at increased risk of severe RSV and may need to be hospitalized.

Health care providers suspect and test for RSV infection in young infants and children who have bronchiolitis or pneumonia during RSV season or during an outbreak in their area.

Testing may be recommended if healthcare providers are trying to identify an outbreak or if a patient requires hospital care. A sample of mucus from the patient’s nose is often used to test for the virus.

For most people, RSV goes away on its own in a week or two, and home treatment is all that is needed. This may include:

• Fever and pain management with acetaminophen (Tylenol®) or ibuprofen (Advil®). Don’t give acetylsalicylic acid (e.g., Aspirin®) to anyone under age 18
• Drinking enough fluids to prevent dehydration
• Clearing your baby's nasal passages with a suction device if breathing difficulties interfere with feeding or sleeping