Pupils wearing masks line up to enter their classroom at the Kgololo Academy on "Spirit Day" in Johannesburg's Alexandra township Tuesday Nov. 30, 2021. Despite global worry, doctors in South Africa are reporting patients with the COVID-19 omicron variant are suffering mostly mild symptoms so far. But they warn that it is early and most of the new cases are in people in their 20s and 30s, who generally do not get as sick from COVID-19 as older patients. (AP Photo/Jerome Delay)