Respiratory Syncytial Virus (RSV): What It Is, Diagnosis, Symptoms & Treatment

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Medically Reviewed By:
Mark Arredondo, M.D.

Respiratory syncytial virus (RSV) is an infectious respiratory disease that can look and sound a lot like a cold, with coughing, sneezing and a runny nose.

But RSV can turn serious and send some patients to the hospital, particularly infants and young children. Learn more about what RSV is, including its causes, symptoms and treatment.

What is RSV?

RSV causes respiratory illness, the American Academy of Pediatrics (AAP) reports.

“Can adults get RSV?” is a frequent question. Adults, babies and children can get RSV, according to the AAP. Sometimes the illness can be severe in infants and children.

In the United States, people usually get RSV from late fall through early spring. "This is a relatively common virus that used to be seasonal in the fall and winter. But over the COVID-19 years, we've seen some changes in that seasonality, with seasons starting earlier or ending later than usual," Dr. Nipunie Rajapakse, a pediatric infectious diseases physician Mayo Clinic, said in a recent article.

RSV causes

You can catch RSV a number of ways, according to the U.S. Centers for Disease Control and Prevention.

  • An infected person coughs or sneezes near you
  • You get virus droplets from a cough or sneeze in your eyes, nose, or mouth
  • You have direct contact with the virus, like kissing the face of a child with RSV
  • You touch a surface that has the virus on it, like a doorknob, and then touch your face before washing your hands

RSV can sometimes cause other health problems that can be more serious than RSV itself. Those problems, explained by the CDC, include:

  • Bronchiolitis, inflammation (swelling) of airways in your lungs
  • Pneumonia, a lung infection.

How is RSV diagnosed?

An RSV test for a child includes a nasal swab test. That’s where the pediatrician will use a cotton-tipped stick to remove some of the mucous inside your child’s nose. They may also order an X-ray and an oxygen saturation test, according to AAP.

RSV symptoms

RSV symptoms aren't the same in babies and children as they are in adults. It’s important to know what symptoms to look for in each case.

RSV symptoms in adults

RSV in adults can cause symptoms such as:

  • Coughing
  • Decrease in appetite
  • Fever
  • Runny nose
  • Sneezing
  • Wheezing

RSV symptoms in babies and children

The AAP says babies and children can get the same symptoms as adults, plus:

  • Bobbing head with each breath
  • Chest caving in (between and under their ribs) with each breath
  • Fast/short breaths
  • Extreme fatigue
  • Flaring nostrils
  • Grunting
  • Poor feeding/no appetite
  • Shortness of breath
  • Stuffy nose

How long does RSV last?

RSV infections usually last no longer than one or two weeks, according to the CDC.

Is RSV contagious?

RSV is contagious, which means that it’s a virus that can go from one person to another when they touch. The virus travels in saliva (spit), mucus and nasal (nose) discharge according to the AAP. "RSV is a respiratory virus, so it's spread by respiratory droplets or by touching droplets from someone who's infected. Avoiding people who are sick, washing your hands, even wearing a mask would prevent transmission of RSV…" said Rajapakse.

You may also be wondering how long RSV contagious is so you know when it’s safe for you or your child to touch another person. If you have RSV symptoms, you were probably contagious one or two days ago. Adults are contagious for three to eight days, warns the CDC, and children (plus people who have weakened immune systems) can be contagious for up to four weeks.

RSV treatment

Treating respiratory illness caused by RSV isn’t complicated. In fact, if you or your child have a mild to moderate illness, you won’t need any treatment at all beyond these steps you should take at home, according to the Mayo Clinic:

  • Drink water
  • Rest
  • Take over-the-counter pain or fever medication

Is there an RSV vaccine?

Preventing respiratory illnesses caused by RSV can save your child a lot of suffering. In July 2023, the U.S. Food and Drug Administration approved an antibody shot known as nirsevimab (Beyfortus) to guard against severe RSV in children. The next month, the CDC's Advisory Committee on Immunization Practices recommended the shot for the following age groups:

  • Babies aged 8 months or younger who were born during or are entering their first RSV season
  • Infants and children aged 8 to 19 months who are at increased risk of severe RSV disease entering their second RSV season.

Living with RSV

Living with RSV means following your at-home treatment plan and watching symptoms, to make sure they don’t get worse.

Two to three infants out of every 100 patients may end up in the hospital, the AAP states. And it’s rare, but according to the academy, some infants can die from RSV. Contact your child’s pediatrician if you have concerns.


American Academy of Pediatrics: American Academy of Pediatrics Recommends Medication to Prevent RSV Be Given to All Infants and Urges Equitable Access

American Academy of Pediatrics: RSV, Flu & COVID: How Are These Respiratory Illnesses Different?

American Academy of Pediatrics: RSV: When It’s More Than Just a Cold

U.S. Centers for Disease Control and Prevention: RSV Transmission

U.S. Centers for Disease Control and Prevention: RSV Symptoms and Care

Mayo Clinic: Drug to Prevent RSV in Babies Approved: What You Need to Know

Mayo Clinic: RSV Season: What Parents Need to Know

What This Means For You

RSV and the common cold may look alike, but RSV can turn serious quickly, particularly in infants and young children. Here is a primer on its causes, symptoms and treatments.

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