In Brazil, influenza epidemics don't start in the crowded cities.
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References
Alonso W. J., et al. Am. J. Epidemiol., doi:10.1093/aje/kwm012 (2007).
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Kaplan, M. Tropical flu spreads the 'wrong way'. Nature (2007). https://doi.org/10.1038/news070604-8
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DOI: https://doi.org/10.1038/news070604-8