Graduate students don't get sick days. But, no one wants to catch whatever it is you've got, including your advisor, so we do get days where we can be off campus and skip meetings. I should consider myself fortunate that I haven't had to rely on sick days too often. I caught strep throat my second week of graduate school, and I was getting over a cold when I "defended" my first-year project, but my rare colds have all coincided with days I didn't have to be anywhere anyway. Until this week.
I should still count myself fortunate in the timing. I didn't get sick until I'd met my teaching obligations, the two group meetings I had to miss wouldn't miss me, and by the time I had to miss my class I was too tired to care about whether my professors noticed. I had two writing projects that let me feel productive when I was feeling okay, and nothing so high-priority I had to stress out when I was feeling drunk on decongestants.
And hey, I should be recovered just in time for the weekend....when the lovely warm weather is supposed to turn into snow.