1. Department of Molecular Genetics and Microbiology, Duke University , Durham, NC 27710 , USA
2. University Program in Genetics and Genomics, Duke University , Durham, NC 27710 , USA
3. Department of Microbiology and Physiological Systems, UMass Chan Medical School , Worcester, MA 01655 , USA
4. Research Animal Diagnostic Services, Charles River Laboratories , Wilmington, MA 01887 , USA
5. Division of Infectious Diseases, Weill Cornell Medical College , New York, NY 10021 , USA
6. Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center , Memphis, TN 38163 , USA