[1] Iowa State Univ, Dept Chem & Biol Engn, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Vet Microbiol & Prevent Med, Ames, IA 50011 USA
[3] Iowa State Univ, Dept Anim Sci, Ames, IA 50011 USA
[4] Iowa State Univ, Dept Kinesiol, Ames, IA 50011 USA
[5] Univ Nebraska Med Ctr, Dept Pharmaceut Sci, Omaha, NE 68198 USA
[6] St Jude Childrens Res Hosp, Dept Infect Dis, Memphis, TN 38105 USA
[7] Univ Iowa, Dept Pathol, Iowa City, IA 52242 USA