Trixy,
We have them as well, and some of the FA's use them when collecting used hot towels.
Personally I have never felt the need for them, not when colllecting towels and not at all when collecting trays!
No we don't get any special "jabs" and I don't think I've picked up anything nasty from the job during the past 20 years.
The human skin is very very good at keeping out nasties, and as long as you do not have an open wound on your hands there is absolutely
nothing to worry about in the normal course of your job.
The above according to my old man, who's a medical doctor.
May The way I see it, the unprotected activities engaged in on stop-overs by a segment of the flying population, are far more risky for long term health than is collecting food trays barehanded.
And of course Biscuit Chuckers advice on wiping your hands is GOOD!