Can an infant get rsv back to back?

RSV immunity: Definitely! there are many strains of RSV and developing immunity to one will not necessarily protect against others. Even receiving synagis (palivizumab) which is pooled antibodies against RSV can't completely eliminate the risk of rsv. Immunity they do have also tends to wane over several months. The good news is that most RSV infections do not result in hospitalization and act like a simple cold.