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We already have issues in high-income regions of trying to get vaccines rolled out in areas that bought millions of doses and trying to figure out : how do we actually target people that are high risk versus those that maybe don't fall politically within that sphere of high-risk disease ? then you start looking at more middle - or low-income areas of the world -- they're not even at a point of being able to think about what the vaccine rollout is going to look like because of the logistical concerns, storage concerns and the fact that the majority of doses have already been bought up by the wealthiest countries in the world.