[1] Ontario Agcy Hlth Protect & Promot, Publ Hlth Lab, Toronto, ON M9P 3T1, Canada
[2] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[3] Mt Sinai Hosp, Dept Microbiol, Toronto, ON M5G 1X5, Canada
[4] CHUQ, CHUL, Ctr Rech, Quebec City, PQ, Canada