did climate play a role in its origin or transmission?
UNANSWERABLE
which countries were affected by the spanish flu United States, France (Brest), Germany and the United Kingdom. it was caused by which virus? H1N1 influenza A virus where was it observed for the first time? United States (in Fort Riley, Haskell County, Kansas as well as in New York City), France (Brest), to name a few.
wiki:13578664
Spanish flu [SEP] Potential origins
Despite its name, historical and epidemiological data cannot identify the geographic origin of the Spanish flu. However, several theories have been proposed.