Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Respiratory Syncytial Virus Infections ?
    ### Response:
    Respiratory syncytial virus (RSV) causes mild, cold-like symptoms in adults and older healthy children. It can cause serious problems in young babies, including pneumonia and severe breathing problems. Premature babies and those with other health problems have the highest risk.
    