[1] McMaster Univ, Dept Pathol, Div Med Microbiol & Infect Dis, Hamilton, ON, Canada
[2] McMaster Univ, Dept Med, Div Med Microbiol & Infect Dis, Hamilton, ON, Canada
[3] McMaster Univ, Dept Clin Epidemiol & Biostat, Div Med Microbiol & Infect Dis, Hamilton, ON, Canada