Respiratory Syncytial Virus (RSV) is a common cause of coughs and colds, with most children getting an RSV infection at least once before they turn two years old. However, it can cause "serious breathing problems", and following a record number of RSV cases in Australia, the UK is being warned over a similar rise here. Respiratory Syncytial Virus (RSV) infections are described as "very common" by the NHS , but can cause serious illness in the elderly and young children. Symptoms of an RSV infectionThe NHS says symptoms of an RSV infection typically start within a few days of getting infected. ðŸ’It's a respiratory virus that can cause serious illness in the elderly & young children.