The Race to Vaccinate by National Geographic Magazine

Experts suggest it may take the development of multiple vaccines, and two doses of vaccine for each person, possibly annually, to begin the process of protecting the world’s population from COVID-19. No vaccine is 100 percent effective, and once a vaccine is approved, there are still many hurdles to overcome before a shot can be made widely available. Governments and scientists have set different, over lapping time lines in order to achieve a vaccine. Here is one ambitious scenario.