[1] Publ Hlth Agcy Canada, Ctr Communicable Dis & Infect Control, Ottawa, ON, Canada
[2] Mc Master Univ, Fac Hlth Sci, Dept Family Med, Hamilton, ON, Canada
[3] Publ Hlth Agcy Canada, Natl Microbiol Lab Branch, Ottawa, ON, Canada
[4] Univ Manitoba, Fac Hlth Sci, Dept Med Microbiol & Infect Dis, Winnipeg, MB, Canada
[5] McGill Univ, Sch Populat & Global Hlth, Epidemi ol Biostat & Occupat Hlth, Montreal, PQ, Canada