Thank you. That's very helpful.
Following on the questions on GPHIN and signals and risk assessment, I have a question perhaps for Mr. Allison.
Especially in the early days of the pandemic, when the risk was really portrayed as low for quite a long time, what metrics were applied to risk assessment, and how do you think we can learn from assessing the risk of what turned out to be a highly-infectious and rapidly-evolving virus with wide geographic spread?
We certainly don't want to overcall risk, but we don't want to under-call it either. I'm really interested in your thinking as we move towards the CIRA, the Centre for Integrated Risk Assessment. What are your thoughts are on the metrics and how much we have learned?