Hey everyone, on our new project Operation War Diary we’re asking you to help with a hashtag. Some of our users have been spotting mentions of illnesses in the diary pages from WWI that are most likely linked to Spanish Flu. It is still not well documented exactly when and where the disease arrived in Europe and these references to it in the diaries could be an extremely valuable source of data.

Many of the pages mention sickness using the acronym PUO which stands for ‘pyrexia of unknown origin’ and Spanish Flu is most likely responsible for the majority of these cases. So we ask that if you spot it then tag the page with #PUO and comment on the number of sick (if mentioned). Get involved in the effort now at http://www.operationwardiary.org/