Model structure.

<p>(A) Compartment model for single infection with pandemic influenza virus. (B) Compartment model for single infection with bacteria. (C) Compartment model for virus – bacterial co-infection in influenza pandemics. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0029219#pone-0029219-t001" target="_blank">Table 1</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0029219#pone-0029219-t002" target="_blank">Table 2</a> for definition of the variables and parameters, and see the text for more details about the model description.