[1] Univ Alabama Birmingham, Dept Pathol, Birmingham, AL 35233 USA
[2] Univ Alabama Birmingham, Dept Microbiol, Birmingham, AL 35233 USA
[3] Univ Alabama Birmingham, Dept Pediat, Birmingham, AL 35233 USA
[4] Spartanburg Reg Healthcare Ctr, Spartanburg, SC USA
[5] Vanderbilt Univ, Dept Pediat, Nashville, TN USA