I think the politics of this goes one of two ways.
First, the pan global approach is accepted as rational in the face of such a cross border threat to humanity. Problem with this outcome is that the pan national organisations such as the EU and WHO have perforned bady thus far. They appear very much deatached from whats happening on the ground.
Second outcome (more likely based on events to date), populations demand proper preparedness for similar future scenarios. At this point it looks like this could only be achieved by more political autonomy allied to a degree of increased economic self suffiiciency when it comes to the production of essentials as mentioned above.