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. 2009 Jan 21;6(40):989–996. doi: 10.1098/rsif.2008.0467

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Copyright © 2009 The Royal Society

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comparison of strain lifetime distribution, F_s(t) (a), and density, f_s(t) (b), functions for models with (red curves) and without (blue curves) transient strain-transcending immunity. Duration of transient immunity is taken to be 0.5 year. Other model parameters are the same as in figure 9.