Van Kerkhove

What I was referring to yesterday in the press conference were very few studies -- some two or three studies that had been published that actually try to follow asymptomatic cases, so people who are infected, over time, and then look at all of their contacts and see how many additional people were infected, and that's a very small subset of studies. So I was responding to a question at the press conference. I wasn't stating a policy of WHO or anything like that.