"Fully vaccinated',
"(Un)Protected",
"N-dose vaccinated"
Protected refers to boosted or fully vaccinated less than six months.
Unprotected refers to fully vaccinated more than six months, partially vaccinated, and unvaccinated.
Prior to June 2022:
Definitions used in [PHAC-0]
Cumulative number of people who have received at least 1 dose
Cumulative number of partially vaccinated people
Cumulative number of fully vaccinated people
Cumulative number of fully vaccinated people with an additional dose
Definitions used in [PHAC-1] (Table 2 - Definitions)
PHAC monitors cases following vaccination using the following categories:
0 dose =
Unvaccinated cases: include those who were unvaccinated at the time of their episode date.1 dose <14 days =
Cases not yet protected from vaccination include those whose episode date occurred less than 14 days after their first dose of the vaccine.1 dose 14+ & 2 doses <14 days =
Partially vaccinated cases include those whose episode date occurred 14 days or more after their first vaccine dose or less than 14 days after their second dose of the vaccine.(either 2 doses or 1 J&J dose) 14+ days, or 3 doses (+) <14 days =
Fully vaccinated cases include those whose episode date occurred 14 days or more after receipt of a second dose in a two-dose series or 14 days or more after receipt of one dose of a one-dose vaccine series,, and, if an additional (i.e., third or booster) dose was received, 0 to <14 days after receipt of the additional dose.3+ doses 14+ days =
Fully vaccinated cases with an additional dose include those whose episode date occurred 14 days or more following the receipt of at least one additional dose (e.g., third or booster) of a COVID-19 vaccine product, after being fully vaccinated.
Note: A COVID-19 vaccine product includes vaccines authorized by Health Canada and vaccines accepted by the Government of Canada for the purpose of travel to and within Canada.
After June 2022
Data extracted on June 30, 2022 for cases between December 14, 2020 and June 12, 2022.
Changes to update schedule
We’ve adjusted our update schedule to reflect changes in how often this data is reported to us.
“Cases following vaccination rate ratio indicators” are updated every 4 weeks.
“Case counts” and “distributions of cases following vaccination” are updated weekly.
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 following vaccination were more common among older adults and females (Table 2). This may be due to:
higher risk of disease among older adults and pregnant people
longer life expectancy among females, which means more women move into older age groups with a higher risk of disease
Older adults have been prioritized for second booster doses. As a result, older people make up a large proportion of people who have been fully vaccinated with 2 or more additional doses. For the same reason, they also make up a large proportion of cases in that group.
...
Fully vaccinated people diagnosed with COVID-19 were significantly less likely to be hospitalized or to die, particularly if they received an additional dose(s).
Between May 09, 2022 and June 05, 2022, unvaccinated cases were 4 times more likely to be hospitalized and 5 times more likely to die from their illness, compared to fully vaccinated cases. During the same 4-week period, unvaccinated cases were 4 times more likely to be hospitalized and 6 times more likely to die from their illness, compared to cases fully vaccinated with 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 4-week age standardized rate ratios
Rate ratios are age-standardized using July 2021 Canadian population estimates.
For analyses of rate ratios, cases are classified as fully vaccinated with one or more additional dose(s) if they have received at least 1 additional dose following the receipt of a primary series (fully vaccinated).
Rate ratio calculations were based on data from 11 provinces and territories that have reported complete case-level vaccine history data to PHAC during the 4-week period of analysis.
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:
laboratory specimen collection date, or
laboratory testing date
PHAC monitors cases following vaccination using the following categories:
Unvaccinated cases: those who were unvaccinated at the time of their episode date.
Cases not yet protected from vaccination: those whose episode date occurred less than 14 days after their first dose of the vaccine.
Partially vaccinated cases: those whose episode date occurred:
14 days or more after their first vaccine dose in a 2-dose series, or
less than 14 days after their second dose of the vaccine.
Fully vaccinated cases: those whose episode date occurred:
14 days or more after receipt of a second dose in a 2-dose series, or
14 days or more after receipt of one dose of a 1-dose vaccine series, and
if an additional (for example, third dose or booster) dose was received, 0 to <14 days after receipt of the additional dose.
Fully vaccinated cases with 1 or more additional dose(s): those whose episode date occurred 14 days or more following the receipt of at least 1 additional dose (for example, third dose or booster) of a COVID-19 vaccine product, after being fully vaccinated.
Data on counts and distributions are further categorized into 2 groups:
Fully vaccinated with 1 additional dose cases: those whose episode date occurred 14 days or more following receipt of 1 additional dose (for example, third dose or first booster) of a COVID-19 vaccine product and, if a second additional dose was received, 0 to <14 days after receipt of that dose
Fully vaccinated with 2 or more additional doses cases: those whose episode date occurred 14 days or more following receipt of at least two additional doses (for example, fourth dose or second booster)
Additional COVID-19 data resources
Download cases and deaths data (.csv) and lab indicators data (.csv)
Download cases and deaths data dictionary (.csv) and lab indicators data dictionary (.csv)
To learn more, visit COVID-19 data trends
Date modified: 2022-07-08