Answer: vaccine

AnswerCrossword Clue
VACCINE

Shot in the arm, perhaps

VACCINE

Shot, perhaps

VACCINE

Hypodermic filler, at times

VACCINE
Shot contents
VACCINE
Laboratory preparation.
VACCINEPublic health weapon
VACCINEFlu forestaller
VACCINESalk's claim to fame
VACCINEBig shot?
VACCINEMedical breakthrough