to help with our questions in studio, we have jennifer have her core -- jennifer and leena from the washington post. we are chatting on friday afternoon. a few hours ago you briefed president obama about the zika crisis. can you give us a sense of what you talked to him about in that meeting? >> the meeting was a meeting between the president and secretary burwell, the cdc director tom frieden and me. update the president an on various aspects of the zika issue. epidemiology and the status of the outbreak in central and south america, particularly concentrating on puerto rico. with the number of travel-related cases and the number of individual women who are pregnant and infected. he wanted an update as to the status of the vaccine development program. it was a lot of discussion back and forth and he went away from that pretty well briefed. >> what is the status of that development? >> faxing development? -- vaccine development? several candidates in various stages of development, preclinical, a few getting ready within a few weeks. probably hours will go at the end of august and the beginning