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Let's say it's a Monday or on Day Zero you get exposed. Day three, you might turn positive on a PCR later that night. Day three and a half or maybe early day four you might turn positive on an antigen test. And so, the whole idea of twice a week is to shave off a considerable part of people's infectious course, and so, if you're using it twice a week, even if you turn positive in the middle of your two tests, by the time you do test, especially because it's rapid, you'll be able to pull yourself out when you've only been spreading for one and a half or two days instead of five days and six days.