[1] Univ Alabama Birmingham, Div Dev & Clin Immunol, Birmingham, AL 35294 USA
[2] Univ Alabama Birmingham, Div Hematol Oncol, Birmingham, AL 35294 USA
[3] Univ Alabama Birmingham, Dept Med, Birmingham, AL 35294 USA
[4] Univ Alabama Birmingham, Dept Pediat, Birmingham, AL 35294 USA
[5] Univ Alabama Birmingham, Dept Microbiol, Birmingham, AL 35294 USA
[6] Univ Alabama Birmingham, Dept Pathol, Birmingham, AL 35294 USA
[7] Univ Alabama Birmingham, Howard Hughes Med Inst, Birmingham, AL 35294 USA