Can someone explain to me what is happening in this diagram and why someone will not get a virus after being vaccinated?

How can a person  best  reduce the risk of injuries on the road?  

Tessa’s friend milo offers her a ride home. tessa does not like riding with milo. he insists that everyone wear a seat belt, and he listens to classical music. he drives a small car, and usually texts while driving. why should tessa refuse milo’s offer? milo texts while driving. milo listens to classical music. milo drives a small car. milo insists that everyone wear a seat belt.

What is the neurological science behind seizures?