You should always get vaccinated.
Peter works next door to a clinic that gives flu shots and is about to go on his lunch break.
Peter wants to leave work during his lunch break.
Peter goes to the clinic, waits in line, and gets a flu shot.
Peter walks past the clinic and goes to a sandwich shop to have lunch.
Peter stays healthy all winter and gets a promotion from his employer because he's so dependable.
Peter catches the flu over winter and misses two weeks of work.