The WHO has the FluNET program and they constantly test a fixed set of people with respiratory symptoms for flu, all around the world. FluNET is precisely why

The WHO has the FluNET program and they constantly test a fixed set of people with respiratory symptoms for flu, all around the world. FluNET is precisely why we know flu dropped so much, and hence the large chunk of people with respiratory symptoms have been COVID-19 or otherwise, but certainly not flu.