A frenzied bout of evolution occurs every flu season, as viruses test the limits of the human immune system. Variants that can evade attack by cytotoxic T cells gain a firm foothold in the viral population even if they confer an advantage in a low percentage of human hosts. A new mathematical model examines this unusual dynamic.
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Wodarz, D. Mutants escape from killer T cells, invade population. Nat Med 9, 1254–1255 (2003). https://doi.org/10.1038/nm1003-1254
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DOI: https://doi.org/10.1038/nm1003-1254