https://www.cdc.gov/malaria/resources/pdf/fsp/drugs/Chloroquine.pdf [PDF from cdc gov] There's a map that shows (in red and yellow) areas of the world where malaria is still commonly occurring. I don't have the podcast link, but I recently listened to a podcast episode where they mentioned that malaria is blamed for about 50% of all human deaths from the beginning of humans as a separate species.