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While Amazon and United Parcel Service pour considerable resources into finding ways of using drones to deliver such things as shoes and dog treats, Zipline has been saving lives in Rwanda since October 2016 with drones that deliver blood. Zipline's autonomous fixedwing drones now form an integral part of Rwanda's medical-supply infrastructure, transporting blood products from a central distribution center to hospitals across the country. And in 2018, Zipline's East African operations will expand to include Tanzania, a much larger country. “Rwanda has shown such remarkable success that a lot of other countries want to follow in its footsteps. The problems we're solving in Rwanda aren't Rwanda problems, they're global problems-rural health care is a challenge everywhere”.
Ackerman et al. (Mon,) studied this question.