1. 1Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, 6439 Garners Ferry Road, Columbia, SC 29209, USA
2. 2Department of Neurosurgery and Neurology, Medical University of South Carolina, Charleston, SC 29425, USA
3. 3Department of Microbiology and Immunology, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA