COVID-19 Data and Surveillance

This interactive tool explores the evolution and spread of SARS-CoV-2 using genomic data produced and analyzed at Public Health Ontario. The tool is intended for genomics researchers and experts, epidemiologists, virologists and public health experts.

The report describes the direct impacts of COVID-19 booster vaccinations on hospitalizations in Ontario.

Describes implications for mask recommendations in community settings in light of the Omicron VOC, based on available evidence, a precautionary approach and policies implemented in other jurisdictions.

This report provides a summary of the case counts of COVID-19, likely source of acquisition, and the timeliness of testing and investigation in Ontario with breakdowns by health region and public health unit.

This bi-weekly report provides an epidemiological summary with a focus on COVID-19 cases in Ontario children and confirmed outbreaks in education settings over time.

An archived collection of weekly reports that provided an epidemiological summary of COVID-19 activity in Ontario.

The number of COVID-19 confirmed cases in Ontario is summarized on epidemic curves by region, age group, and gender. The reproduction number and doubling time by region is also provided.

This report provides a focused analysis of confirmed COVID-19 cases among vaccinated long-term care home and retirement home health care workers and residents in Ontario.

Describes implications for mask recommendations in community settings in light of the Omicron VOC, based on available evidence, a precautionary approach and policies implemented in other jurisdictions.

Describes implications for mask recommendations in community settings in light of the Omicron VOC, based on available evidence, a precautionary approach and policies implemented in other jurisdictions.

PHO is using serosurveillance to better understand what proportion of the Ontario population has COVID-19 antibodies and to identify hot spots and high risk groups.

This epidemiological summary is the second in a series presenting information on COVID-19 cases with a focus on outcomes resulting in hospitalization or death. It examines differences between waves 1, 2, 3 and 4, as well as by age groups.

This report provides information on cycle threshold (Ct) values stratified by vaccination status of S-gene target failure (SGTF) COVID-19 cases detected by Public Health Ontario (PHO) laboratory.

This report describes the relationship between COVID-19 incidence and vaccination rates across Ontario neighbourhoods.

This brief report summarizes information on COVID-19 cases associated with school outbreaks, with a focus on vaccination age-eligibility and vaccination status from July 4 to November 6, 2021.

This report estimates the prevalence of Omicron (B.1.1.529) in Ontario, and examines the growth rate of Omicron relative to Delta.

An epidemiologic summary of cumulative confirmed COVID-19 outbreaks and outbreak-associated cases in Ontario by setting, from February 16, 2020 to June 12, 2021.

This quick epidemiological summary presents information on COVID-19 cases with a focus on outcomes resulting in hospitalization or death. It examines differences between waves 1, 2, 3 and 4 over time, as well as, by age groups.

A summary of confirmed COVID-19 cases and outbreaks reported in congregate living settings (group homes/supportive housing, shelters, correctional facilities, short-term accommodation and other congregate settings) in Ontario.

This report includes estimates of the incidence, prevalence, and growth of SARS-CoV-2 variants in Ontario based on mutation profiles (N501Y and E484K).

This report uses the Ontario Marginalization Index to explore trends in health-equity among people aged 18 years or older who have received at least one dose of the COVID-19 vaccine in Ontario.

A focused analysis of transmission patterns, testing strategy, case detection and severe outcomes of COVID-19 cases in Ontario. We review changes over time within the context of key public health measures.

This report provides a focused analysis of laboratory-confirmed COVID-19 cases in children reported in Ontario, as per the Ministry of Health’s case definition.

An analysis of COVID-19 case characteristics among health care workers including trends, geography and severity.

This report provides a focused analysis on confirmed outbreaks in elementary and secondary schools in Ontario from August 30, 2020 to March 13, 2021, as well as cases associated with these outbreaks.

This report combines individual case data with neighbourhood-level data on socio-economic status to assess how COVID-19 impacts Ontario neighbourhoods differently.

A descriptive analysis characterizing confirmed COVID-19 cases who were hospitalized or in the ICU because of COVID-19 or who died, as reported in CCM.

This report provides estimates of the proportion of infections that are identified as cases in Ontario by age group, up to May 17, 2020.

Descriptive summary of COVID-19 variant of concern cases circulating in Ontario.

This report provides an epidemiological summary of COVID-19 cases in Ontario with a focus on neighbourhood material deprivation.

This report provides a focused analysis of confirmed COVID-19 cases and outbreaks reported among long-term care home (LTCH) residents and health care workers (HCW) in Ontario.

This report provides a summary of confirmed adverse events following immunization (AEFIs) managed as anaphylaxis that occurred following a COVID-19 vaccines in Ontario.