 Well, that's difficult to say. Typically, rebound is going to occur within a very few days of having COVID. So the typical person will say they're better on day five and they're clearly getting well. They may even be testing negative, and then two or three days later, they test positive again, and their symptoms return, albeit usually milder. So that's the typical picture. But we've seen people rebound a week, 10 days later.