We analyzed the dynamics of an influenza A/Albany/1/98 (H3N2) viral infection, using a set of
mathematical models highlighting the differences between in vivo and in vitro infection. For
example, we found that including virion loss due to cell entry was critical for the in vitro model but
not for the in vivo model. Experiments were performed on influenza virus-infected MDCK cells in
vitro inside a hollow-fiber (HF) system, which was used to continuously deliver the drug amantadine. The HF system captures the dynamics of an influenza infection, and is a controlled environment for producing experimental data which lend themselves well to mathematical modeling. The parameter estimates obtained from fitting our mathematical models to the HF experimental data are consistent with those obtained earlier for a primary infection in a human model. We found that influenza A/Albany/1/98 (H3N2) virions under normal experimental conditions at 37°C rapidly lose infectivity with a half-life of ~ 6.6 ± 0.2 h, and that the lifespan of productively infected MDCK cells is ~ 13 h. Finally, using our models we estimated that the maximum efficacy of amantadine in blocking viral infection is ~ 74%, and showed that this low maximum efficacy is likely due to the rapid development of drug resistance.
Originally published as:
Beauchemin, C. A. A., McSharry, J. J., Drusano, G. L., Nguyen, J. T., Went, G. T., Ribeiro, R. M., & Perelson, A. S. (2008). Modeling amantadine treatment of influenza A virus in vitro. Journal of Theoretical Biology, 254(2), 439-451.