The low rate of coronavirus infections, hospitalizations and deaths in West and Central Africa is the focus of a debate that has divided scientists on the continent and beyond. Have the sick or dead simply not been counted? If Covid has in fact done less damage here, why is that? If it has been just as vicious, how have we missed it?

The answers “are relevant not just to us, but have implications for the greater public good,” said Austin Demby, Sierra Leone’s health minister, in an interview in Freetown, the capital.