Infectious Disease Trends in Ontario 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 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. Additional surveillance information is available on each disease-specific webpage, where available.

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: 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.