US President Donald Trump has been pushing it as a remedy for Covid-19, with zero evidence. Now, SA is taking part in a global trial to see if the antimalarial drug chloroquine can protect doctors and nurses at the frontline from contracting the coronavirus.

The trial will test the drug, or a placebo, in 55,000 doctors and nurses in SA, Zambia Ireland, the UK and the US over five months. Where they do get Covid-19, the study aims to assess whether they get a milder form of the disease...