Respiratory Syncytial Virus (RSV) Infection

When a respiratory syncytial virus (RSV) infection affects the nose and throat (upper Reference respiratory system Opens New Window Reference Opens New Window), symptoms are usually mild and resemble those of the common cold. They include:

• Cough.
• Stuffy or runny nose.
• Mild sore throat.
• Earache.
• Fever, usually at the beginning of the illness. A high fever does not mean the illness is more severe.

Babies may have additional symptoms, including:

• A decreased interest in their surroundings.
• Listlessness and sleepiness.
• Fretfulness (irritability) and not sleeping well.
• Poor feeding.
• Apnea, where breathing stops for about 15 to 20 seconds. This usually occurs only in babies who were born prematurely and who also have a history of apnea.

It is hard to distinguish between a common cold and RSV infection. But unless you or your child has an increased risk of complications from RSV, it usually is not important to know which virus causes symptoms.

RSV infection sometimes leads to Reference bronchiolitis Opens New Window or Reference pneumonia Opens New Window or both.

Symptoms of these complications include:

• Reference Difficulty breathing Opens New Window, which may include breathing more rapidly than Reference normal.
• Reference Wheezing Opens New Window.
• Coughing that is getting worse. A child may choke or vomit from intense coughing.
• Lethargy, increased tiredness, decreased interest in surroundings, or loss of interest in food.

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