PLEASE NOTEThe Washington Post is providing this story for free so that all readers have access to this important information about the coronavirus. For more free stories, .Covid-19 has killed more than 6 million people and infected more than half a billion since it first emerged in Wuhan, China, in late 2019, according to data compiled by Johns Hopkins University.Despite the rollout of vaccines and the relaxation of strict measures in some parts of the world, global health experts warn that the pandemic is set to continue, with no end in sight. Variants such as delta and omicron have...…PLEASE NOTEThe Washington Post is providing this story for free so that all readers have access to this important information about the coronavirus. For more free stories, .Covid-19 has killed more than 6 million people and infected more than half a billion since it first emerged in Wuhan, China, in late 2019, according to data compiled by Johns Hopkins University.Despite the rollout of vaccines and the relaxation of strict measures in some parts of the world, global health experts warn that the pandemic is set to continue, with no end in sight. Variants such as delta and omicron have...WW…