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Published online 7 June 2007 | Nature | doi:10.1038/news070604-8
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Tropical flu spreads the 'wrong way'
In Brazil, influenza epidemics don't start in the crowded cities.
The notion that flu epidemics start in areas of high population density and spread outwards may not hold true for the tropics, hints a study from Brazil.
In that country, new research reveals, flu starts in the less densely populated north and moves towards cities in the south.
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