Wearing a mask, washing your hands, good ventilation and keeping your distance all help to lower your chances of getting infected by the virus that causes Covid-19

South Africa must make dramatic shifts in its Covid-19 prevention strategies to include new evidence that Sars-CoV-2 spreads mainly through the air

Only 18 countries are using dexamethasone, while tocilizumab and sarilumab can cost hundreds or thousands of dollars a dose