You consider it given that a vaccination will render you immune. Not always true. After receiving back my initial bloodwork for the screening that I am required to do, I discovered that I lack immunity to measles, hepatitis A, and hepatitis B. As a child, I completed standard vaccinations for each of these.
What does this mean for me? Mostly, more needles! And a warning against blindly trusting any vaccine to accomplish it’s work. I’m hoping to learn more about why vaccines work, and sometimes don’t.
The upshot is, my nurse has been giving me some wonderful tips on how to administer injections! She’s quite a pro. Now, if only I wasn’t the demonstration patient too 
!
