[1] Univ Alabama Birmingham, Dept Pediat, Birmingham, AL 35233 USA
[2] Univ Alabama Birmingham, Dept Microbiol, Birmingham, AL 35233 USA
[3] Univ Alabama Birmingham, Dept Med, Birmingham, AL 35233 USA
[4] Univ Alabama Birmingham, Dept Neurosurg, Birmingham, AL 35233 USA
[5] Univ Alabama Birmingham, Ctr Biodefense & Emerging Infect, Birmingham, AL 35233 USA
[6] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[7] Univ Virginia, Sch Med, Charlottesville, VA 22908 USA
[8] Univ Utah, Salt Lake City, UT USA
[9] Lenox Hill Hosp, New York, NY 10021 USA
[10] NYU, Sch Med, New York, NY 10021 USA
[11] Univ Michigan, Sch Publ Hlth, Dept Epidemiol, Ann Arbor, MI 48109 USA