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Effectiveness against infection in may was 92%, but then it dropped to 80% months later. yet, at the same time, protection against hospitalization continued. dr. fauci, if the vaccines are diminishing over time, how many boosters do you think people are going to need? >> i would doubt if we're going to need many boosters. when we try to find out the breadth and the depth of the response by a booster, it is really extraordinary. it goes up by multiple-fold, at least 20- to 30-fold. so, we don't anticipate that beyond this we're going to need anything else. >> reporter: there is reason for worry...

Antibody tighters when you do a third immunization dose. last slide. so in summary, the current immunological data that indicate that antibody levels decline over time, higher levels of antibody are associated with a higher level of efficacy, higher levels of antibody may be required to protect against delta and, as i showed you on this former slide, a booster mrna immunization increases antibody titers by multiple-fold. all of this support the use of a third booster mrna immunization to increase the overall level of protection. we'll go back to you now, jeff. >> thank you drs. murthy, fauci a...