I tend to believe in the "Do what you can do get to the show and get it done no matter what" camp. I work through head colds, sore throats, minor infections.
The only time I have been close to calling out for a show was 3 years ago when I got food poisoning. And honestly, I should have. I was a wreck, everyone knew I was a wreck. The stupidest thing? I was Co-Stage Manager and I had another SM calling the show with me who could have ran the whole thing. It was a weird set up, she was running the lights and calling her own cues, I was running sound and calling my own cues, but for one sequence, she called the cues for both because the lights and sound had to go together. Yet, I struggled through it, and made some theatrical magic....Hell, I even dragged my ass to a job interview earlier that day. Again, all very very stupid things I wish I had not done in hindsight.
The only reason I have missed time was in college when I got pink eye during a rehearsal process. I didn't want anyone else to catch it and I was responsible for touching lots of props and since it's so infectious, I stayed home for three days until it went away.