Hep B

Doctors at the teaching hospital probably thought med students were cute, so they gave us a kiddies bandaid after our first Hep B vaccination.
One way or another, it did bring a smile to my face.

In the Netherlands, medical personnel must get a Hep B vaccination. Three of them, even.
Several weeks after the 3rd and final vaccination, we'll have our blood tested for the amount of antibodies. If 10mIU per mL gives a human lifelong protection, medical personnel must have a blood titer of 100mIU per mL. That way, we'll never get to infect a patient.