\"It was scary,\" DiGrigorio told \"GMA.\" \"Before he was transferred into the ICU he was in a regular room and he went into respiratory failure. They said [he] was doing better with Albuterol [breathing] treatments they were giving him and then it went downhill from there.\"

Dr. Jennifer Ashton, chief medical correspondent for ABC News, said RSV first appears like the common cold and symptoms are based on age.

\"While adults and older children may have mild or no symptoms at all, babies and toddlers may experience runny noses which may then progress to sneezing, cough, fever, fatigue,\" Ashton told \"GMA,\" adding that RSV the most common cause of pneumonia in babies under the age of 1.

RSV is the most common cause of pneumonia in babies under the age of 1. @DrJAshton has the latest on what you need to know about this upper respiratory virus and our @ErielleReshef shares her family's own brush with the dangerous virus. https://t.co/GKTbHyyeEr pic.twitter.com/HzghTb0HhG

— Good Morning America (@GMA) December 31, 2019

Here's what parents need to know to keep kids safe.

Symptoms of RSV

Fever, runny nose, cough, congestion, lack of appetite, fussiness.

Later on: wheezing and sometimes trouble with breathing.

\"PHOTO:
ABC
PHOTO: As germs spread in the cold weather season, health professionals are reminding parents of RSV -- the common respiratory virus that could be dangerous to young children.
>

Preventing RSV

Always wash your hands, especially before and after contacting someone with the infection.

Clean surfaces.

Avoid contact with those whose may be infected.

Infants who are either born preterm (less than 29 weeks) or born with chronic lung disease may require a vaccine to prevent RSV since they are at risk of developing more complications from it. Parents should discuss this with their pediatrician.

\"PHOTO:
ABC
PHOTO: Leann Tate, a mother from Virginia, told "Good Morning America" she had an RSV scare with her son Cameron. The 3-month-old at first had a runny nose and a deep, wet cough.
>

When to take your child to the hospital

Head to the emergency room if you notice your little one is lethargic, or is showing signs of difficulty breathing such as:

1. Using their belly, neck or rib muscles when breathing.
2. If their nose flares when breathing.
3. If they are breathing very quickly.
4. Blue-ish discoloration around the lips or nail beds -- that can be a sign they're not getting enough oxygen.

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