Along the equator, where seasons do not follow the familiar rhythms of the northern world, Kenya's health researchers have discovered that the country's most dangerous influenza wave arrives not in the cold of June and July, as long assumed, but in the wet heat of October, when El Niño rains descend. A six-year study spanning nine hospitals — from Nakuru to refugee camps at Kakuma and Dadaab — has quietly redrawn the country's disease calendar. The finding is less a medical surprise than a reminder that geography shapes illness, and that knowing when a wave will break is the first step toward