Q: Why do I need to get a booster shot
for a disease I've already been vaccinated against? A: A vaccine
protects you from a disease by teaching your body to recognize and
fight the pathogen that causes the disease.
It does this by creating memoryT
& B-cells. But because the # of memory cells
can decrease over time, your body can forget what a certain pathogen
looks like, and consequently no longer be ready to fight it. A booster
shot is just another vaccine shot that reminds
your body how to recognize the pathogen.