Also washing hands frequently to prevent contamination of medicines etc with germs and the like. Same reason should tie hair back really.
Not wearing jewellery etc which could have germs on etc which could pass on.
Wearing protective clothing like overalls etc not only to protect your own clothing but also to stop outside microorganisms being brought into the workplace, particularly when working with medicines like I do myself. Protect clothing in terms of loose articles getting caught in drawers, units etc.
Just a few examples, hope this helps KD