New flu strains are more likely to arise in equatorial countries, where influenza is present the year round and surveillance is poor.
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References
Rambaut, A. et al. Nature 453, 615–619 (2008).
Russel, C. A. et al. Science 320, 340–346 (2008).
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Butler, D. Swine flu attention turns to the tropics. Nature 459, 490–491 (2009). https://doi.org/10.1038/459490a
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DOI: https://doi.org/10.1038/459490a
