US president Donald Trump is back at the White House after his brief hospital stay, but continues to be treated for Covid-19.
Among his medicines, he is being given the intravenous antiviral drug, remdesivir, and a powerful steroid, dexmethasone.
Trump says he is is well on the road to recovery, but doctors say a relapse is still possible.
Kurt Krause is Professor of Biochemistry at the University of Otago, Dunedin.
