[1] Vet Affairs Med Ctr, Louis Stokes Cleveland, Res Serv, Cleveland, OH 44106 USA
[2] Case Western Reserve Univ, Sch Med, Dept Med, Infect Dis Sect, Cleveland, OH 44106 USA
[3] Univ Hosp Cleveland, Case Med Ctr, Div Infect Dis & HIV Med, Cleveland, OH 44106 USA
[4] Case Western Reserve Univ, Sch Med, Dept Mol Biol & Pharmacol, Cleveland, OH USA
[5] Case Western Reserve Univ, Sch Med, Dept Microbiol, Cleveland, OH USA