[1] Allegheny Gen Hosp, Inst Med, Div Infect Dis, 420 East North Ave, Pittsburgh, PA 15212 USA
[2] Allegheny Gen Hosp, Inst Med, Dept Internal Med, Pittsburgh, PA 15212 USA
[3] Allegheny Gen Hosp, Inst Med, Div Pulm & Crit Care Med, Pittsburgh, PA 15212 USA
[4] Drexel Univ, Coll Med, Philadelphia, PA 19104 USA
[5] US Ctr Dis Control & Prevent, Div Parasit Dis & Malaria, Ctr Global Hlth, Atlanta, GA USA