[1] Tufts Univ, Sch Med, Ctr Adaptat Genet & Drug Resistance, Dept Mol Biol & Microbiol, Boston, MA 02111 USA
[2] Duke Univ, Dept Microbiol & Immunol, Durham, NC 27710 USA
[3] Inst Pasteur, Unite Agents Antibacteriens, Paris 15, France
[4] Univ Erlangen Nurnberg, Lehrstuhl Mikrobiol, Erlangen, Germany
[5] Univ Washington, Dept Pathobiol, Seattle, WA 98195 USA
[6] Monash Univ, Dept Microbiol, Clayton, Vic 3168, Australia
[7] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2H7, Canada
[8] Univ Alberta, Dept Med Microbiol & Immunol, Edmonton, AB T6G 2H7, Canada