The BBC has an interesting article on the need to start planning for possible vaccine distribution https://www.bbc.com/news/business-54067499" rel="noopener noreferrer - https://www.bbc.com/news/business-54067499

Shipping a coronavirus vaccine around the world will be the "largest transport challenge ever" according to the airline industry. The equivalent of 8,000 Boeing 747s will be needed, https://www.iata.org/en/pressroom/pr/2020-09-09-01/ - the International Air Transport Association (IATA) has said. There is no Covid-19 vaccine yet, but IATA is already working with airlines, airports, global health bodies and drug firms on a global airlift plan.  The distribution programme assumes only one dose per person is needed.

The scope of the problems is summed up:-

Flights to certain parts of the world, including some areas of South East Asia, will be critical as they lack vaccine-production capabilities, he added.

and poor Africa (but if we believe their official figures then they don't need it!)

Distributing a vaccine across Africa would be "impossible" right now IATA says given the lack of cargo capacity, size of the region and the complexities of border crossings.

let's face it the 3rd world will be last to get any vaccine....