Thank you, Dr. Cohen. I appreciate that.
I'll go back to Dr. Warshawsky, if I might.
My colleague talked a bit about doses in the future, vaccine durability and how many doses we're going to need. Dr. Warshawsky, could you speak a bit, if you would, about the future of vaccines and what that may look like in terms of variants? How many doses are we talking about? I believe Israel is on dose number five.