$INO A bit early: Yi Chen Got it. And could you tell us what are the countries in which you are going to pursue the COVID heterologous booster strategy? Jacqueline Shea So what I can say here is that we're currently in discussions with regulators in a number of countries. And we hope to be making announcements about which countries we'll be pursuing our heterologous boost approaches in the coming months. But I think it's a little early to comment on that yet.