erika lyons has a question about the johnson & johnson vaccine. she is wondering if it's not effective with asymptomatic spread. what do you know? >> it's pretty effective against ah symptomatic spread. investigators studied whether or not it could prevent asymptomatic transmission by checking antibody levels on people. believe it or not. and it was found to be pretty effective over 70% that asymptomatic transmission. so right on target with over all efficacy of the drug. of the vaccine. sorry. >> vanessa has a question for you. can you still spread covid if you are fully vaccinated? do we have a little bit more data on that today as part of that new study? >> no, they didn't talk about those cases. but they have been antic total cases of people being infected with covid, as we all know. but less data on those people actually spreading it. the idea is, they probably will have a lower chance of spreading it. but we just don't understand that well enough. it's probably a viral load. because they have less symptomatic when they do get it, nobody goes