Have you ever wondered why the CDC vaccine card has four slots on the front?
Not really, it just looked to me like it filled the blank area of a standard dimension card. Are you surprised when index cards have lines to the bottom, and not just enough?
Though, I admit it had triggered a small, gamer part of me that wanted to get the completionist award for filling every slot.
Are populations with large majorities of people who’ve received 2-3 injections seeing total or near eradication of coronavirus? I’m not aware of any examples.