ERRATUM
Volume 1, issue 2, e00135-10, 2010, https://doi:10.1128/mBio.00135-10. The files for Fig. S1 and S2 were incorrect (they were reversed). The files have been corrected online.
Volume 1, issue 2, e00135-10, 2010, https://doi:10.1128/mBio.00135-10. The files for Fig. S1 and S2 were incorrect (they were reversed). The files have been corrected online.