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ScienceDaily (Apr. 27, 2011) — "In urban communities, less than 1 in 100 inhabitants died from Spanish flu in 1918, but in isolated communities up to 9 out of 10 died. An important explanation for the differences is due to different exposure to influenza in the decades before the Spanish flu came. Those living in urban communities probably had a higher degree of pre-existing immunity that protected against illness and death in 1918 than those living in very isolated rural areas. This is shown in a new study from the Norwegian Institute of Public Health.

Previous studies have suggested that an important reason for the large regional differences in mortality must be that people living in cities were more frequently exposed to similar viruses to the one that caused the Spanish flu earlier in life than those living in rural and extremely isolated areas..."


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