ian lipkin in new york, welcome to hardtalk. good to be with you. me start with something you said just a few weeks ago. you said, "it would not surprise me if a substantial proportion of the entire world population becomes infected with covid—19." do you still feel that way today? i do. it will take some time, but this virus is spreading across the world at enormous speed, and the only thing really between us and bona fide infection of the entire world really is a vaccine, and that's several months away. the knowledge base upon which we develop our efforts to combat covid—19, is it still quite narrow or has it expanded massively over the past three months? there's been a dramatic amount of collaboration worldwide, the speed at which you've seen publications and press releases on the development of drugs, diagnostics, insights into the way in which this virus causes the disease is absolutely unprecedented. and yet the implication of what you first said to me is that none of that expanded knowledge and more effective response is going to make much di