This was based on a review of the evidence through the special advisory committee, which I've just talked about, with the other chief medical officers of health. That was based on the evolving science, looking at the role of asymptomatic and presymptomatic transmission and the evolving research that is being published. There was very, very little research being published prior to that, so we kept updating our advice based on the latest information. I think our—
On May 19th, 2020. See this statement in context.