• The RSV Season
• Ways to Help Avoid the Spread of RSV

Respiratory syncytial (sin-SISH-shul) virus (RSV) is a very common virus. RSV usually causes moderate-to-severe cold symptoms in adults and children. But premature babies or those with certain heart problems or chronic lung disease have a high risk of getting very sick if they catch RSV disease early in life. This is because premature babies do not have fully developed lungs. Also, because they were born early, they may not have received enough virus-fighting substances (called antibodies) from their mothers that help them fight off RSV disease and other viruses.

Each year, an estimated 125,000 infants in the United States are hospitalized with severe RSV disease, the leading cause of infant hospitalization.^1,2 Severe RSV infections may cause up to 500 infant deaths annually in the United States.³ RSV disease may also cause long-term health problems, such as asthma.

RSV season usually starts in the fall and runs through the spring.^4,5 But it can change. In some areas of the United States, RSV season may last all year. Ask your child’s healthcare provider when RSV season occurs in your area. If your baby is at high risk for severe RSV disease, be sure to discuss additional protective steps you can take during your baby's next appointment. Learn more about risk factors for RSV disease.

Some Symptoms of RSV Disease
Usually, RSV causes mild, cold-like symptoms, such as a runny nose and fever. However, in some babies, the symptoms can quickly get worse.

Call your healthcare provider right away if your baby has any of these symptoms:

• Fever. In an infant younger than 3 months of age, a fever greater than 100.4° F (rectal) is cause for concern
• Persistent coughing
• Wheezing
• Rapid breathing
• Problems breathing or gasping for breath
• Blue color of the lips or around the mouth

Worsening symptoms can be very serious. That is why it is so important to help prevent RSV disease.