Studies indicate that you're infectious for about 7 days, so that's the rationale. Of course you will still need care for a couple of weeks.
We live in Charleston County. Total cases are 441 (that's about 1.1 per 1000).
We're doing much better than Greenville. According to the U.S. Census, Greenville is about 25% larger in population. Both are trending down.
The county with the most cases is Richland. The county seat of Richland is Columbia, which is also the state capital.