boosted, you have less likely chance of getting these serious infections. but there are also things that don't require hospitalization, you know, "the new york times" columnist mara gay documented her long covid. is there evidence to suggestion you may be impacted now and a asymptomatic. who is to say six months from now you might get out of breath climbing stairs. is there research that shows you're absolved from long haul covid now? >> it's muchless likely if you have no symptoms at all you'll get long covid. long covid is seen in people with minimum symptoms, moderate symptoms and severe and it can be seen rarely in people with no symptoms at all but it's seen in a very considerable proportion of people from 10 to 30 or more percent of people who have symptomatic covid-19 disease.