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There's been more than 24 million cases reported to date. And we need to look at something like this on a population level. And so it's very important that we document this -- and that, in countries that can do this, if sequencing can be done, that would be very, very helpful. But we need to not jump to any conclusions, even if this is the first documented case of reinfection, it is possible of course because with our experience with other human coronaviruses, and the MERS coronavirus and the SARS-CoV-1 coronavirus, we know that people have an antibody response for some time but it may wane.