[1] Publ Hlth Agcy Canada, Nosocomial Infect, Natl Microbiol Lab, Winnipeg, MB R3E 3R2, Canada
[2] Univ Hlth Network, Toronto, ON, Canada
[3] Mt Sinai Hosp, Toronto, ON M5G 1X5, Canada
[4] Rouge Valley Hlth Ctr Centenary Site, Scarborough, ON, Canada