Esp. when I had a friend, who wasn't even diabetic, yet had a small wound opening, contracted some kind of bacteria and was dead in two days. It's just a matter of sterility, the discovery of which has saved countless lives, esp. women giving birth. They used to die all of the time because docs didn't know they were contaminating the women's "childbed" with non-sterile, ungloved hands whilst delivery a baby.

I get my blood coagulation checked every month due to the artificial heart valve and the blood thinner I take to prevent it making clots. I wouldn't want the nurses to touch me with a lancet or needle without making sure my finger is sterile with a swab and they have on gloves, esp. in that environment.