My 11 week old just spent days in CCMC for rsv pneumonia. It presents like a cold with a cough and low grade fever. Watch for fever spiking and decreased appetite. They have a rapid test just a nasal swab, but I will warn you the rapid swab test was negative and the blood work confirmed elevated wbc counts and rsv, which prompted the chest xray to find the pneumonia. While @ ccmc the nurses said they've seen a lot of it recently.