Start at Wuhan. Draw a big circle around it; 2 Chinas large. Anyone in that circle with the ability to develop general antivirals and vaccines were the ones who could be assigned a notional responsibility. I picked on India because I'd heard it produces a lot of medicine and they have enough smart people to accomplish anything. As I stare at Google maps, Japan and Korea probably have the capability as well.

If Europe and the US can have ready-to-go antivirals for every possible disease ever then they are encouraged to do that; but realistically for a virus from an Asian reserve it is reasonable to expect the antivirals will be researched and produced in Asia. Can't be ready for everything; and the US should probably be focusing on possible pandemics from Africa where the locals don't have the sort of technical mastery found in Asia.