First wave took 4 mos (perhaps) which went largely unnoticed. When the 2nd wave began in late Aug., it emerged similarly to Covid. People weren't quite sure if something was happening and then it showed up in Africa, Europe and the U.S. simultaneously. -NB | #1918Pandemic https://t.co/Ig0Gb3wi73

— National WWI Museum (@TheWWImuseum) March 26, 2020