Doctor Unknowingly Kills Everyone, Nurse Practices Giving Herself Shots

by Hil
(Tulsa, Oklahoma, USA)

My fiance was describing a horror film he once saw that took place in a hospital.

A body comes in, and this doctor begins unknowingly killing everyone.

At one point, a nurse begins practicing finding veins on herself and says, 'I can hit it every time', while repeatedly stabbing herself in the arm.

If anyone happens to know what this movie is called, your answer is most appreciated. I've searched countless movie sites looking for a film that fits this description, but have drawn a blank.

Thanks in advance!