[1] Queens Univ Belfast, Sch Med, Dept Microbiol & Immunobiol, Belfast BT12 6BN, Antrim, North Ireland
[2] Univ Maryland, Sch Med, Ctr Vaccine Dev, Baltimore, MD 21201 USA
[3] Max Planck Inst Infekt Biol, Mol Biol Abt, D-10117 Berlin, Germany
[4] Univ Illinois, Dept Microbiol, Urbana, IL 61801 USA
[5] US FDA, Ctr Biol Evaluat & Res, Bethesda, MD 20892 USA
[6] Univ British Columbia, Biotechnol Lab, Vancouver, BC V6T 1Z3, Canada
[7] Washington Univ, Sch Med, Dept Mol Microbiol, St Louis, MO 63110 USA