ERRATUM
Volume 91, no. 11, e00050-17, 2017, https://doi.org/10.1128/JVI.00050-17. Page 18, Acknowledgments, paragraph 1, line 4: The following sentence should appear before the sentence beginning “This work”: “Electron microscopy was performed at the Multiscale Microscopy Core (MMC) with technical support from the Oregon Health & Science University (OHSU)-FEI Living Lab and the OHSU Center for Spatial Systems Biomedicine (OCSSB).”