Symptoms of respiratory syncytial virus can be similar to a mild cold in older, healthy children and adults.
In babies under 12 months, premature infants, individuals with heart or lung disease, immunocompromised individuals, older adults, and individuals with other serious medical problems, respiratory syncytial virus can cause severe infection.
Symptoms of respiratory syncytial virus infection usually appear within 4-to-6 days after infection. Symptoms of respiratory syncytial virus infection include decreased appetite, runny nose, congestion, cough, sneezing, fever, sore throat, headache, and wheezing.
Symptoms of severe respiratory syncytial virus infection may also include fever; severe cough; wheezing; short, shallow, and rapid breathing or difficulty breathing; bluish skin; poor appetite; extreme fatigue; and irritability.