Thank you, Dr. Chagla.
I have a minute left, so I'm going to Dr. Bogoch, now.
Could you comment, please, on priority? You talked about surveillance. I'm wondering what entity would be responsible for that internationally. Would it be the IATA? Would it be the World Health Organization? Finally, as we see inequality within vaccination, perhaps you could comment on immunity passports, in 50 seconds, Dr. Bogoch.