Yesterday, President Biden invited world leaders to a virtual summit on ending the pandemic, with a goal of vaccinating at least 70% of the world by next September, according to the Washington Post.At a World Health Organization (WHO) briefing today, health officials—including several from African groups—welcomed the partnership, but said there are urgent steps countries can take now to free up more vaccine doses for countries that don't have enough access.Summit goal: vaccinate 70% of world over the next yearIn the invitation to world leaders, Biden called on governments, international groups, and philanthropic and nongovernmental organizations to commit to ending the pandemic by taking concrete actions and setting targets, according to