Upon returning to your station following a run, you should disinfect the ambulance as needed. disinfection is most accurately defined as:

Disinfection is a procedure of cleaning a surface or an object,  particularly with an anti-bacterial substance, so as to kill microorganisms or bacteria.

Explanation:

In most cases, disinfectants are not exchangeable,  and inaccurate application and improper disinfectants can bring about inordinate expenses.

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.