Institution: | Department of Microbiology and Immunology, University of Tennessee and Veterans Administration Medical Center, Memphis, Tennessee 381631.; Department of Microbiology and Immunology, Bowman Gray School of Medicine at Wake Forest University, Winston-Salem, North Carolina 27157-10642.; and Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-05243. |