Respiratory Syncytial Virus (RSV) is a highly contagious virus that primarily affects the respiratory system. For most people, RSV causes cold-like symptoms such as coughing, and difficulty breathing. RSV is most commonly transmitted in close-contact settings, particularly during the colder months when people are more likely to gather indoors. While RSV is typically mild in healthy adults, it can be serious, even life-threatening, for infants, older people, and those with weakened immune systems. For more ...