Respiratory Syncytial Virus (RSV) is a highly contagious virus that primarily affects the respiratory tract, causing infections ranging from mild cold-like symptoms to more severe respiratory illnesses such as bronchiolitis and pneumonia. Commonly impacting infants and young children, as well as older adults and individuals with weakened immune systems. 

RSV spreads through respiratory droplets and direct contact with contaminated surfaces. The virus often leads to symptoms like coughing, sneezing, fever, and difficulty breathing. While most cases of RSV resolve on their own, severe infections may require medical attention. Prevention measures include practicing good hygiene, such as frequent handwashing and vaccination.