1 Department of Immunobiology and the University of Arizona Center on Aging, University of Arizona College of Medicine, Tucson, AZ, USA.
2 University Animal Care, University of Arizona, Tucson, AZ, USA.
3 Department of Medicine, University of Arizona College of Medicine, Tucson, AZ, USA.
4 Vir, Inc., San Francisco, CA, USA.
5 Department of Immunobiology and the University of Arizona Center on Aging, University of Arizona College of Medicine, Tucson, AZ, USA. nikolich@email.arizona.edu.