South African Health Minister Zweli Mkhize speaks during a press conference with Members of the National Command Council's Economic Cluster in Pretoria, South Africa, Tuesday March 24, 2020, one day after South African President Cyril Ramaphosa announced a three-week national lockdown to contain the spread of the coronavirus. For most people the virus causes only mild or moderate symptoms. For others it can cause more severe illness, especially in older adults and people with existing health problems. ( Phill Magakoe/Pool Photo via AP) XJD102