There is evidence that this mild first wave originated in North America. Influenza was present in many countries in the northern hemisphere in late 1917 and early 1918. According to historian Geoffrey Rice, author of Black November, a well-documented outbreak in Haskell County, Kansas, in January–February 1918 bore all ‘the characteristics of a new pandemic flu – high attack rate, higher morbidity rate and greater mortality than is usual for influenza
American soldiers abrought the disease to Europe, where the first cases appeared near the huge transit camps at Brest and Bordeaux in early April. By June the first wave had spread across most civilian populations in Europe.
becoming prevalent in New Zealand in Septembe
severe second wave were emerging.
The first cases of a more severe form of influenza emerged amongst British and French troops serving on the Western Front in early July 1918.
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