User blog comment:BoltOfSpades/Salem/@comment-6719710-20150620154432/@comment-6719710-20150621082407

Well chances are you will use it on someone near the most champions guaranteeing at least 1 or 2 transfers.

No one has QSS early in the game, nor do people rush it, Cleanse has a way longer cooldown, and not every support buys Mikael's.

I'm assuming enemies can be re-infected, some guy on your team with a hook or a knockback makes that easy to accomplish