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. 2013 Oct 18;8(10):e75806. doi: 10.1371/journal.pone.0075806

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© 2013 Dorélien et al

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 author and source are properly credited.

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The contour plot illustrates the transition from annual to biennial epidemics. The timing of the epidemic did not change significantly with changing birth rate () and amplitude (). ( = 0, = 1000, = 0).

Inline graphic — The contour plot illustrates the transition from annual to biennial epidemics. The timing of the epidemic did not change significantly with changing birth rate () and amplitude (). ( = 0, = 1000, = 0).