There is a very good post from univ oxford on this topic: https://ourworldindata.org/spanish-flu-largest-influenza-pandemic-in-history https://ourworldindata.o

There is a very good post from univ oxford on this topic: https://ourworldindata.org/spanish-flu-largest-influenza-pandemic-in-history https://ourworldindata.org/spanish-flu-largest-influenza-pan... which provides more scientific background and real numbers and compares it with other flu pandemics and the ongoing covid pandemia.