“…Here we propose a triangle of viral persistence will help identify seasonal and other drivers of the wax and waning of viral diseases. Timing of winter-peaking diseases, but not their amplitude, scales with latitude when analysing weather and health insurance claim databases across U.S. counties ( Schober, Rzhetsky, & Rust, 2021 ). This latitude scaling suggests seasonality across many respiratory pathogens in temperate zones responds to annual changes in irradiance and possibly a human circannual clock.…”