1. The South Texas Center for Emerging Infectious Diseases, The University of Texas at San Antonio, San Antonio, TX, USA
2. Department of Biology, The University of Texas at San Antonio, San Antonio, TX, USA
3. Department of Microbiology, Immunology, and Parasitology, School of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA, USA
4. Department of Oral and Craniofacial Biology, Dental School, Louisiana State University Health Sciences Center, New Orleans, LA, USA