That's unfortunately still going to take a little while. I can tell you that some of the animal studies to look at reinfection are under way. You infect some animals, then you wait for a little while, let them develop immunity, and you reinfect them. In humans, this is something that is now a part of the Solidarity study and others that are going to address those questions, but it's going to take a little while before we have those results.
On April 30th, 2020. See this statement in context.