Infectious Disease Trends in Ontario Tool
Data previously shared through PHO’s monthly Diseases of Public Health Significance Cases are now fully integrated into IDTO. As a result, these PDF reports will no longer be published. Archived reports are available upon request. For COVID-19 and Influenza data, please refer to our Ontario Respiratory Virus Tool.
The Infectious Disease Trends in Ontario interactive tool provides 10 years of analyzed data on diseases of public health significance (DOPHS) in Ontario. Data are collected by the public health units primarily from clinicians, laboratories and hospitals and then analyzed by PHO.
Users can explore, compare, and analyze annual data for selected DOPHS in Ontario, by age and sex, public health unit, hospitalizations, and deaths where available. This tool can help with surveillance, as well as inform program planning and policy.
Case counts presented in this tool include only the confirmed classification for all diseases, except for the following diseases where both confirmed and probable cases are included in the total counts: amebiasis, anaplasmosis, babesiosis, Lyme disease, mumps, pertussis, Powassan virus, invasive meningococcal disease (IMD), invasive Haemophilus influenzae (Hi) disease all types, and West Nile virus (WNV) illness. Case classifications are specified in the provincial surveillance case definitions outlined in Appendix 1 of the Infectious Diseases Protocol.
Interpret surveillance results for DOPHS in 2020 through to 2023 with caution due to changes in the availability of health care, health seeking behaviours, public health follow-up, and case entry during the COVID-19 pandemic and subsequent recovery period.
How to Use
The tool is best viewed on desktop or tablet.
Information in the Annual Data tab is updated annually and includes 10‑year trends. Information in the Monthly Data tab provides a preliminary provincial snapshot of current data diseases for selected diseases, refreshed monthly.
To learn how to navigate the tool, see our User Guide.
To see information on source data, classifications, citations, definitions and more, see our Technical Notes.
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