[1] E Tennessee State Univ, James H Quillen Coll Med, Dept Internal Med, Div Infect Dis, Johnson City, TN 37614 USA
[2] E Tennessee State Univ, Coll Med, Dept Microbiol, Div Infect Dis, Johnson City, TN 37614 USA
[3] James H Quillen Vet Affairs Med Ctr, Med Serv, Johnson City, TN 37614 USA