The COVID-19 Cohort Study (CCS) is recruiting participants from the Greater Toronto Area (GTA) for a research study.

Study Information

Study title: COVID-19 Cohort Study (CCS): Study of the epidemiology of COVID-19 in healthcare workers and their households (REB #20-0080-E approved by the Sinai Health System REB)

Study investigators: Drs. Allison McGeer & Brenda Coleman (Sinai Health System), & Dawn Bowdish (McMaster University)

Why are we doing it?

  • ​To identify workplace, community, and other risk factors for infection
  • To identify microbiome & early immune responses that may protect us
  • To estimate the incidence of infection among people working in healthcare
  • To find out if viral load is associated with severity of symptoms
  • To determine immune responses over time
  • To describe the psychological impact of working during a pandemic

Who can participate?

Physicians, nurse practitioners, midwives, physicians’ assistants, nurses, receptionists, or other healthcare workers working in private medical practices/clinics or hospitals who:

  • ​Are 18-75 years of age
  • Work in the GTA (greater Toronto area)
  • Have convenient access to computer or phone with internet access
  • Plan to be available for at least the next 3 months

What is required?

  • ​Questionnaires when you join and then every week (online)
  • When (if) tested for COVID-19: report results, symptoms, and contact with ill people & submit a swab to the study the same day

Optional sections

  • ​​​​S​elf-collect blood samples:​ ​When you join, in 6 months, at the end of the study, & when you test positive for COVID-19 (to see if you have COVID-19 antibodies)
  • ​Invite adults & children in your home to join​

Other Information

  • ​Participation is voluntary and participants may leave the study at any time
  • Participants will be provided with a small token of appreciation for taking part in the study

For more information about the study, please visit

If you have any questions about the study, please email the study office at or call the office at 416-294-6383

Updated on March 30, 2021