[1] Providence Hosp, Infect Dis Sect, Dept Med, Washington, DC 20017 USA
[2] Quest Diagnost Nichols Inst, Dept Microbiol, Chantilly, VA 20151 USA
[3] Univ Manitoba, Fac Med, Dept Med Microbiol & Infect Dis, Winnipeg, MB R3A 1R9, Canada
[4] Orlando Reg Med Ctr Inc, Dept Med, Orlando, FL 32806 USA
[5] Univ Louisville, Sch Med, Div Infect Dis, Louisville, KY 40202 USA