Respiratory Syncytial Virus — or as most people refer to it, RSV — is not a new virus; it was discovered in 1956. Most children will have been infected with it by the age of two years old. It typically arises on the radar of physicians during the cool weather months of mid- to late-fall and then lingers into spring. This year, however, RSV made an appearance unseasonably early, with an increase in its activity starting in May.