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COVID-19 epidemiology update: Cases following vaccination Download page in .pdf format

Summary of COVID-19 cases, hospitalizations and deaths, cases following vaccination, testing and variants of concern across Canada and over time. Older versions of this report are available on the archived reports page.

Cases following vaccination

Note: We are in the process of improving this page. Regular data updates will resume in the coming weeks. Data extracted on for cases between December 14, 2020 and .

While COVID-19 vaccines are highly effective at preventing severe outcomes such as hospitalization and death, vaccinated people can still get infected if exposed. This means that even with high vaccine effectiveness, some vaccinated people will get sick, be hospitalized or die.

Most people in Canada have been vaccinated. Because they’re a larger group, there will naturally be more cases among vaccinated people than among unvaccinated people. However, despite their higher case counts, vaccinated people are less likely to get very sick or die.

Case counts underestimate the total number of COVID-19 cases because a rapid increase in cases starting in December 2021 led to changes in COVID-19 testing policies and delays in data entry.

Case counts are likely to over-represent people at risk of severe disease, because they have been prioritized for testing. Data should be interpreted with caution.

Cases reported since the start of the vaccination campaign, as of July 03, 2021

The vaccination campaign began on December 14, 2020. Since then, we've received case-level vaccine history data for 75.5% (n=624,980) of known COVID-19 cases aged 5 and older.

Of these cases:

For definitions of the different vaccination statuses, please refer to the Technical notes and definitions section.

Figure 1. of outcomes of confirmed COVID-19 cases reported to PHAC by vaccination status as of July 10, 2021

Figure 1: Text description
Outcomes of confirmed COVID-19 cases reported to PHAC by vaccination status, as of July 10, 2021
Status Cases Hospitalizations Deaths

July 10, 2021.

Cases following vaccination were more common among older adults and females (Table 1). This may be due to:

Older adults have been prioritized for second booster doses. As a result, older people make up a large proportion of people who had completed their primary vaccine series and 2 or more additional doses. For the same reason, they also make up a large proportion of cases in that group.

Table 1. Characteristics of confirmed cases by vaccination status, as of July 10, 2021

People who were diagnosed with COVID-19 after completing their primary vaccine series were significantly less likely to be hospitalized or to die, particularly if they received an additional dose(s).

Between and , unvaccinated cases were times more likely to be hospitalized and times more likely to die from their illness, compared to cases with a completed primary vaccine series. During the same 4-week period, unvaccinated cases were times more likely to be hospitalized and times more likely to die from their illness, compared to cases with a completed primary vaccine series and 1 or more additional doses (see data notes in Technical notes and definitions section).

Technical notes and definitions

Data for this analysis comes from the COVID-19 national data set, which contains detailed case-level information received by PHAC from all provinces and territories.

Data notes for Table 1
Data notes for 4-week age standardized rate ratios
Vaccine status definitions

Episode date: Refers to symptom onset date. When symptom onset date is unavailable or the case is asymptomatic, episode date refers to either:

PHAC monitors cases following vaccination using the following categories:

Additional COVID-19 data resources

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