Delta variant July 22, 2021 3:43 pm What Is the Lambda COVID-19 Variant? So far, the “variant of interest” has been detected in 29 countries, and it may spread more quickly than milder versions of the coronavirus. US & World Videos 1:40 Charlie Puth reacts to Taylor Swift's ‘The Tortured Poets Department' name-drop 2:52 Severe weather kills at least 5 as tornadoes rip through Midwest and South 2:07 Campus tensions continue to escalate in Boston 2:08 Tension grows over campus protests in Boston 2:39 MIT president calls for shutdown of student encampments