What does a business owner do when he’s sick?

The whole family has been sick this week, including myself. For me, it’s not enough of an illness to put me out of action, but it did bring some interesting points to mind, and an altering of goal for the short-term. I guess it’s more of a question when you cross the line from being self-employed to operating a business. Sure, self-employed people are businesses by themself, but when they’re sick the business grinds to a halt. Where’s the line, though. When you begin to employ people that will work even when you’re not there?