Nearly a year after many rich nations achieved widespread vaccination against COVID-19, many less affluent countries still face difficult choices about which groups of people should be the first to receive vaccines from a limited supply. Most of these nations appear to be following vaccine-allocation guidelines from the World Health Organization (WHO), which advocate vaccinating older adults first. However, an analysis from Rutgers researchers suggests different allocation strategies may work better for different nations. In some cases, different allocation strategies may be more effective in minimizing COVID-19 deaths. In others, nations might justifiably choose a different goal. To read the full story.