briefing documents for moderna and pfizer, with one dose they reached about 35 to 45%. it was the second dose that got them to 94 or 95%. so it's the same two-dose regiment as moderna and pfizer. >> even though one dose is appealing to a lot of people, even though the efficacy rate is a little low, it does inspire more people who actually get vaccinated? >> no, absolutely. we certainly have groups that absolutely benefit from this johnson & johnson vaccine. and we want to have always remember that. and also, we want to know that it was 100% protected against death and hospitalization. those were the main end points. although there's slightly less efficacy, with regard to symptomatic infections, the main end points of complications and death are very real.