Thank you for the question. I'm a fundamental scientist, not a vaccine manufacturer, so you'll understand when I say that it's really outside my own area of expertise.
When we discussed that issue on the vaccine task force, I think the issues that came up pretty quickly were around how complicated it is to make vaccines. These are not like the N95 masks that we just heard about, for example. These are biologics that are being injected into healthy people.
It's very sophisticated science and these are very sophisticated public health issues, so the production and the manufacture of all these vaccines is very complicated. Indeed, if you look at the holdup with Pfizer—which is a very experienced vaccine manufacturer—in scaling up their manufacturing, I think you get a sense of how complicated it is to actually make vaccines.