As I said, as we reviewed the science and as data available, there was very little scientific information. Some of it was through influenza studies, some through laboratory studies and some through modelling studies. We took the body of it that very week. We took a number of publications into account and, as I said, a lot of it was also predicated on the publications on asymptomatic and presymptomatic transmission.
On May 19th, 2020. See this statement in context.