[1] St Jude Childrens Res Hosp, Dept Infect Dis, Memphis, TN 38105 USA
[2] Univ Tennessee, Hlth Sci Ctr, Microbiol Immunol & Biochem Grad Program, Memphis, TN 38103 USA
[3] Cairo Univ, Fac Pharm, Dept Microbiol & Immunol, Cairo 11562, Egypt
[4] St Jude Childrens Res Hosp, Dept Immunol, Memphis, TN 38105 USA
[5] Univ Tennessee, Hlth Sci Ctr, Dept Pediat, Memphis, TN 38103 USA