fauci knew the best way to stop zika was to develop a vaccine. >> fauci: we had an, "okay, all handstype of meeting. "let's do it. we've got to do it." >> lapook: dr. fauci and his team had a head start. he showed us how a vaccine they'd already created for west nile virus was re-configured for zika. >> fauci: this is what's called a d.n.a. platform. and a d.n.a. platform is made up of a plasmid, which is merely a circular piece of d.n.a., and what it has in it, is an area where you can actually insert the gene of whatever virus you want to make a vaccine against. so, we just stick in this gene from zika. and now you have a zika vaccine, merely by replacing this little segment. >> lapook: kind of like a prefabricated scaffolding, right? >> fauci: the foundation stays the same. you put in the part. if the part is west nile, you stick the west nile in. you want to do zika? you take the west nile out. you put zika in. >> lapook: the d.n.a. in vaccines like this can be quickly mass produced. this new approach means future vaccines could take months, not years, to reach clinical trials. >

>> fauci: but people don't-- people don't. >> lapook: how do you explain that? >> fauci: they tend to say, "well, i'm-- i'm not seeing anything. so it must not be happening."

>> fauci: they tend to say, "well, i'm-- i'm not seeing

>> fauci: but people don't-- people don't.

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