[1] Natl Ctr Child Hlth & Dev, Off Infect Control, Tokyo, Japan
[2] Natl Ctr Child Hlth & Dev, Dept Med Subspecialties, Div Infect Dis, Tokyo, Japan
[3] Natl Ctr Child Hlth & Dev, Dept Surg Subspecialties, Div Dermatol, Tokyo, Japan
[4] Univ Tennessee, Hlth Sci Ctr, Dept Microbiol Immunol & Biochem, Memphis, TN 38163 USA