The Spanish flu, also known as the 1918 influenza pandemic, was an unusually deadly influenza pandemic caused by the H1N1 influenza A virus. Lasting from February 1918 to April 1920, it infected 500 million people – about a third of the world's population at the time – in four successive waves. Deaths: 17–100 million (estimates)
One hundred years later - 2019 COVID-19 pandemic.137 million cases, 2 million 960 thousands deaths.
The Spanish flu started on hundred years ago and continued for two years. Had four waves.
The COVID-19 started 2019 and continued for now. Had two waves, but pandemic continues.
Can we expect third and forth wave of COVID-19 in shorth time future?