[1] INST PASTEUR,UNITE AGENTS ANTIBACTERIENES,PARIS 15,FRANCE
[2] DUKE UNIV,DEPT MICROBIOL & IMMUNOL,DURHAM,NC 27706
[3] UNIV ERLANGEN,ZENTRUM MIKROBIOL,D-8520 ERLANGEN,FED REP GER
[4] UNIV WASHINGTON,DEPT PATHOBIOL,SEATTLE,WA 98195
[5] UNIV ALBERTA,DEPT MED MICROBIOL,EDMONTON T6G 2H7,ALBERTA,CANADA
[6] UNIV ALBERTA,DEPT MED MICROBIOL & INFECT DIS,EDMONTON T6G 2H7,ALBERTA,CANADA