you're asymptomatic, there are studies out of the university of pennsylvania that shows that upwards of 50% of all persons who have tested positive will end up developing long covid, meaning that your organ functions, your brain, your liver, your kidneys, they're no longer working as they did before you got covid. so it's not something that you want -- >> dr. hilton, thank you so much for doing this not just this morning, on christmas morning, it's important people are meeting each other today and i think everybody's got this on their mind but for the work you've done over the last two years, going out there, reaching out to people who have concerns about getting vaccinated, and about their health care. dr. ebony hilton is a critical care doctor at the university of virginia and a msnbc medical contributor and our thanks by the way to all of the medical correctors who for the last two years, contributors who have told us things and taught us things that none of us new about the virus. coming up, on "velshi,"