1. Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA,
2. Genetic Engineering and Biotechnology Division, National Research Center, Cairo, Egypt,
3. Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, USA,
4. Department of Pathology, University of Florida, Gainesville, FL, USA, and
5. Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL, USA