We already have influenza tests! If you go to a doctors office presenting with Flu-like symptoms, they will likely run a test for influenza. The rapid tests, most commonly found in urgent cares, take about 10-15min and are 90-95% accurate. There is also an RT-PCR test that is very sensitive in detecting viral RNA, but takes more time. There are also Rapid Influenza Diagnostic Tests that are antigen based. These can be done at home, similar to the COVID-19 home test, but their accuracy is lower (50-70% accuracy).