[1] Univ Toronto, Dept Med, Toronto, ON, Canada
[2] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[3] Publ Hlth Ontario Lab, Publ Hlth Ontario, Toronto, ON, Canada
[4] Sunnybrook Hlth Sci Ctr, Infect Prevent & Control, Toronto, ON, Canada
[5] Sunnybrook Hlth Sci Ctr, Div Infect Dis, Toronto, ON, Canada