Signs and symptoms of an RSV infection will usually start 4 to 6 days after being infected. Some of the symptoms can include: 

• Runny nose 
• Decreased appetite 
• Cough 
• Sneezing 
• Fever 
• Wheezing (high-pitched whistling sound made while breathing) 
• Poor sleep 
• Fussiness (infants and toddlers) 

Children with worsening symptoms should be seen immediately in the emergency room and may need to stay in the hospital for observation and care. 

Call 911 or go to your nearest emergency department if your child is experiencing any of the following: 

• Audible wheezing sounds 
• Breathing very fast and shallow — more than 60 breaths a minute 
• Laboured breathing — the ribs seem to suck inward when the infant inhales 
• Nostrils flaring 
• Very tired or lethargic, and not as responsive 
• Refusing to drink or eat, or breathing too fast to eat or drink 
• Blue skin, especially the lips and fingernails