Sick lady serving food with mask

So I'm at KFC Bellville and they lady that's making the drinks wears a big white mask. I ask her what's up with the mask and she tells me she is sick. Now Thats bad because she works with food, how can management let her work like that.

So I ask her why is she working with our food whiles she sick and knows she had flue it's not hygienic. This lady tells me she is working for her bonus and that's why is serving people with their food. I felt so disappointed in KFC cause when I left I was to scared I'd might get sick so I dumped my cooldrink