The Spanish influenza is said to have infected anywhere from a fifth to over one half of the world’s population at the time. The virus may have killed somewhere between 1 to 10 percent of the people it infected.
Tiek lēsts, ka ar spāņu gripu inficējās no 20 līdz 50 procentiem pasaules iedzīvotāju, un 1 līdz 10 procenti inficēto nomira.