I always use gloves.
The risks of getting an accidental cut, from whatever we dig up, can be fatal in the worst scenario.
Two Things pop up in my mind straight away.
One is a long time surviver...
1) ANTRAX, (Usually found were horses just to graze, still dangerous even after 100 years!!!)
2) A cut from ANY object in the ground can" give" you Tetanus.
I always have my vaccination card with me when I'm out hunting.Better save than sorry!!!
Not 100% sure, but I think I put the warning for cuts while we are out detecting here on this forum some time ago.
Chances it happens to you are perhaps slim, but gloves are a must whilst metal detecting, in my humble opinion.
Have a great hunt friends!!!

Alain