The term 'shot contents' refers to the components of a shot or injection. VACCINE (7 letters) is a biological preparation used to provide immunity against a particular disease. Sera (4 letters) are the liquid portion of blood that contains antibodies and other proteins. DOSE (4 letters) is the amount of a substance given at one time. SERUM (5 letters) is the clear, yellowish fluid that separates from the blood when it clots. Together, these four components make up the contents of a shot.