You are obviously the only one thinking straight here since an sv* is spread through food handlers almost most of the time. Those girls should not have come to work sick and your boss should have made them go home. That's exactly how we spread things around. UGH! That makes me so mad.
Anyway, I hope that you are still healthy and that you have calmed down a little bit. I'm sure if you keep washing your hands and keep them away from your face that you'll be ok. Good Luck! Keep us posted.