Covid-19 mortality rate and the Silent Partner Effect

A deadly, unidentified virus, Vx, can cause unusually large and deadly outbreaks when it is misdiagnosed as some other, known virus, V. I explain how it can happen, why it can happen, and how to identify it from the data.
Vx = unusual influenza
V = SARS-CoV-2

Original paper from July 2020: https://www.preprints.org/manuscript/202007.0475/v2)

Enjoy!