[1] HOP ST JUSTINE, DEPT MICROBIOL & IMMUNOL,SEROIMMUNOL LAB, MONTREAL H3T 1C5, QUEBEC, CANADA
[2] UNIV MONTREAL, DEPT MICROBIOL & IMMUNOL, MONTREAL H3C 3J7, QUEBEC, CANADA
[3] HOP ST JUSTINE, BACTERIOL LAB, MONTREAL H3T 1C5, QUEBEC, CANADA
[4] UNIV MONTREAL, DEPT PATHOL, MONTREAL H3C 3J7, QUEBEC, CANADA