we always believe the positive tests. we always want to err on the side of caution, but you can test negative, negative, negative, and several days later, potentially a positive. i think what they did with the vice president was incredibly important to keep away exposure if it was likely. we go back and look. she got her moderna, second shot, well past six months. she's not 65, but she falls into that institutional and occupational risk. i hope somebody gets her and the president boosters asap because this also reflects, kendis t tension we have with breakthrough cases and how we're living through this threat. >> there were r so many anti-vaxxers who use it as an opportunity to say, see, it durjt work. they were negative. it seems to be an issue with testing at this point. doctor, thank you.