RSV (Respiratory syncytial Virus)
Respiratory syncytial (RSV) is a common respiratory virus that usually causes mild, cold-like symptoms. However, in some cases, RSV can cause more severe infections such as bronchiolitis (an inflammation of the small airways in the lungs) and pneumonia (an infection of the lungs). Some groups, including infants and older adults, are more likely to develop severe RSV and need hospitalization.