Germ-terrain duality of sickness, equivalent of wave-particle duality of light for the biological sciences? Bechamp revisited

Growing up in Ibadan, West Africa as we children played soccer, catch, skipping rope and many other games and sports in the hot sun our parents and adult passersby would shout at us to play under the trees ‘or we would catch malaria’. We all hated the bitter tasting chloroquine tablets and dreaded the painful chloroquine injection and so most times we would transfer our frolicking to under some shade of trees. At the age of six I was totally convinced that strenuous exercise under the hot sun caused malaria fever.