[1] Mayo Clin, Div Clin Microbiol, Dept Lab Med & Pathol, Rochester, MN 55905 USA
[2] Mayo Clin, Div Infect Dis, Dept Med, Rochester, MN 55905 USA
[3] Harvard Univ, Sch Med, Dept Microbiol & Mol Genet, Boston, MA 02115 USA
[4] Fauquier Hosp, Dept Med, Div Infect Dis, Warrenton, VA USA
[5] Northside Hosp, Dept Med, Atlanta, GA USA