Context from the link:
RemoteControlledUser asks
What changes are we going to have to make to how businesses operate to maintain our economy while providing social distancing?
And Bill Gates answers:
The question of which businesses should keep going is tricky. Certainly food supply and the health system. We still need water, electricity and the internet. Supply chains for critical things need to be maintained. Countries are still figuring out what to keep running.
Eventually we will have some digital certificates to show who has recovered or been tested recently or when we have a vaccine who has received it.
Another comment is left below:
... he's saying Microsoft and MIT developed "tatoo markers" that show whether you have recieved a vaccine or not. This will be coupled with Gate's new invention, ID2020, which is a digital ID microchip implanted under the skin.
www.sciencealert.com/an-invisible-quantum-dot-tattoo-is-being-suggested-to-id-vaccinated-kids
http://news.mit.edu/2019/storing-vaccine-history-skin-1218
of course he has more practice at public relations than me, so he can put it more mildly
(post is archived)