As vaccine roll-outs bring the end of the pandemic closer in wealthier countries, many poorer nations are enduring a surge in coronavirus cases without access to life-saving vaccines. COVAX, a global initiative aimed at equitable access to COVID-19 vaccines, is working hard to bridge the divide. Anuradha Gupta, deputy CEO of Gavi, the Vaccine Alliance, talks with Ray Suarez about why vaccinating the whole world is not only the right thing to do, but will keep the disease from mutating into a more dangerous one. Can we vaccinate a planet of 7.9 billion before the virus gets the best of us?