Ontario COVID-19 Effective Reproduction Number Estimates

Ontario's weekly effective reproduction number (Re) estimates for COVID-19, including confidence intervals, are provided by the Government of Ontario. The data tracks the average number of secondary infections per case across different regions. It was last updated in March 2026.

Use Cases

• Model the relationship between public health interventions and changes in the effective reproduction number (Re) over time.
• Analyze regional variation in COVID-19 transmission by comparing Re values across different region entries.
• Assess the uncertainty in transmission estimates by utilizing the provided confidence intervals for each Re value.
• Track the temporal progression of the pandemic's contagiousness using the week start and end dates.

Strengths

• Data is provided by the authoritative Government of Ontario public health organization.
• Includes confidence intervals for the effective reproduction number, quantifying estimate uncertainty.
• Maintained with recent updates, last refreshed in March 2026.

Limitations

• Unknown total row count and temporal coverage limits assessment of statistical power.
• Data granularity is limited to weekly periods and regional aggregates, not individual case data.

Provenance

Source

Government of Ontario

Collection Method

null

Time Range

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Freshness

Last updated 2026-03-18.

Geography

Ontario, Canada