When I worked at Walmart, we didn't even have real sick days; you could only have three excused absences in six months before you were written up.

That summer I managed to acquire bronchitis three separate times. I'd get one day of rest and then hope I'd be capable of standing by the time I needed to be in to open.

I imagine many large retailers--including grocers--have similar policies. If you plan on keeping your job, you are required to come to work, big honkin' gobs of green phlegm or no. You can only hope that the manager will take pity on you and send you home once you're there.