Two years after the pandemic began, more countries are shifting toward a return to normal and learning to live with the virus.
Safe and effective vaccines have been developed and experts know a lot more about how to keep the coronavirus under control since it emerged in late 2019.
Some questions remain about the virus. Studies are underway to better understand long COVID-19, which can persist for months after an initial infection.
And scientists are on the lookout for the next fast-spreading variant.
