That's a very good question. I alluded to this earlier, that the presence in semen, for example, is new knowledge. Prior to this outbreak there were only very rare cases of sexual transmission.
I think the U.S. now has identified six, if not more, potential cases of sexual transmission, where men have gone to a Zika-infected country and brought it back and infected a woman through sexual transmission. The knowledge base so far is that it stays in semen about two weeks, as far as we know. That science will change, and as I said in the opening, our recommendations will change if the science changes.
We're not aware of any other evidence of it staying anyplace else in the body at this time. There's no evidence of that, but we're watching very carefully and watching the science and would change, as I mentioned, recommendations if it does.