. >> you raise an interesting point, i would like to bring that to you, patrick tan.who have not been offered boosters are worried about immunity, particularly people who might have been given a vaccine that was less effective in the first place. should they be worried? are those concerns founded? >> for different people who are at different risk for severe to be -- disease, that is where the question has to be. for people who are not at risk for severe disease, they don't have to be worried as much. but people in some of the higher risk groups, they do have to be more careful in terms of what they do, especially if they are having waning immunity, if they have had only one shot of certain vaccines or two shots of a less effective vaccine, it has to act accordingly. or wait for their government plan to roll out their jobs if necessary. >> you can understand the concern even from a messaging point of view of people trying to figure out what is best for them compared -- for them. so long the message was get vaccinated, you can die from covid, get vaccinated. people did