M et al.Author ManuscriptAuthor ManuscriptAuthor ManuscriptGautam et al.DFZWPage13.11.11.10.9.6.2.2.1.1.0.0.0.DFZV16.13.14.12.12.11.10.10.0.ACKNOWLEDGEMENTSWe thank R. Plishka, A. Peach and T. Lewis for determining plasma viral RNA loads and K. Rice, R. Engel, R. Petros and S. Fong for diligently assisting in the maintenance of animals and assisting with procedures. We also thank R. Schwartz, Vacc