i really like this flu study.
what causes the flu in equator level counties if it isn't from the cold, isn't from being indoors on a seasonal basis and isn't from changes in relative humidity
"Through this, we show that influenza in Vietnam does not show consistent timings, making preparedness efforts such as vaccination campaigns difficult to design."

Repeatability and timing of tropical influenza epidemics
Author summary Much of the world experiences influenza in yearly recurring seasons, particularly in temperate locations. Such seasons occur each ye...