with zika with what we have done with rubella. some people may remember in the 1960s, there was considerable risk, about congenital rue bea babies were born in the united states, and the rubella vaccine was really originally directed to women of child-bearing age. the way you get women of child-bearing age, you vaccinate everyone when they're children so they wind up being protected. the good news is we have made successful vaccines against other flavi viruses. others fever are yellow fever, dengue and west nile. conceptually i don't see any scientific road block to developing a vaccine for zika. in that regard, as soon as we realized we would have to put a full-court press on this, we started working on a zika vaccine. we have done it with the kinds of technologies we have made out successful vaccine. we have a list of about four or five vaccines that are at different levels that we can move them from preclinical into phase 1 study to see first if they're safe. the big thing about vaccines, the most important thing is saved, beca