Tim Harford Columnist

The race to find an effective vaccine appears to be on the home straight. The same cannot be said of the race to roll it out everywhere. Preparing to present a BBC radio series titled “How to vaccinate the world”, I’ve been looking at the route ahead. It is less of a marathon, more of an assault course.

So, in no particular order, here is a brief guide to some of the obstacles that remain:..

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