BIRX: "I think the thing that confuses Americans, and I've heard this in the Rocky Mountain states, when we tell people that these masks prevent transmission, they're not perfect, but when we tell them they prevent transmission and then we close the spaces where people are 100% masked and leave open the spaces where the people are unmasked, which we know is a transmission area, that's confusing to the American people. I understand why it's confusing. They're like, 'Okay, you said masks work, and I'm doing, I'm here, and these spaces are safe, and you're closing my space and leaving open the spaces where people are unmasked.' I think that's very — I worry about that, because then it gives people the option to say, 'Well, bars and restaurants are open, then I can have 20 people over for Thanksgiving,.' And so I don't like it to be any number, I like it to be — keep it to your immediate household. Because, you know, if you say it can be ten, and it's eight people from four different families, then that probably is not the same degree of safe as ten people from your immediate household."