1. Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
2. Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA
3. Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin, USA
4. Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
5. Division of Laboratory Animal Research, University of Pittsburgh, Pittsburgh, Pennsylvania, USA