In an email to Global News, PHAC said the country’s surveillance data “continues to indicate low rates of COVID-19 cases after vaccination.”
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The agency added, however, that only nine jurisdictions in Canada are currently reporting “vaccine history questions” that contribute to the country’s COVID-19 dataset.
PHAC said as of May 13, 2021, a total of 13,461 COVID-19 infections have been reported among those who received their first dose of the vaccine.
The agency said 64 percent (8,565) of cases were reported in people who were still within 14 days of their first dose of the vaccine.
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During this time, 36% – or 4,896 infections – were reported at least 14 days after the person’s first dose was given. The agency said this reflected the “period of time required to build partial immunity” to the virus.
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PHAC said the 4,896 cases reflected 2.3% of the cases reported by the nine reporting jurisdictions since the start of vaccine deployment.
The agency said that of the 4,896 cases for which additional information was available, 9.2% of infections resulted in hospitalization and 3% resulted in death.
PHAC noted, however, that as vaccine deployment in Canada has focused primarily on the elderly, cases reported after vaccination “tend to be from an older demographic.”
PHAC added that for this reason, “no comparison should be made between hospitalizations / deaths among post-vaccination cases and hospitalizations / deaths among all Canadian cases of COVID-19.”
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Dr Zain Chagla, an infectious disease specialist at McMaster University, said the numbers are “quite remarkable”.
“It’s good,” Chagla said. “You’re looking at numbers in those roughly 95 percent in terms of infection prevention.«
Chagla said some people can look at almost 4,900 cases after the first dose and think ‘this is terrible’…
“But in the big picture, over the same time period you are looking at over 500,000 cases of COVID-19 outside of children, and only about 5,000 of them are represented in the group that received a first dose.” vaccine in 14 days. “He said, adding that it was” quite encouraging “.
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From when the first dose of a vaccine was given in Canada in mid-December to the end of April – about two weeks before May 13 – 750,569 cases of COVID-19 have been reported.
During the same period, a total of 1,3420,198 doses of approved COVID-19 vaccines were administered.
After 2 doses
In addition, the number of new coronavirus infections after vaccination fell further among those who received two doses.
As of May 13, 3.54% of the Canadian population was fully vaccinated against COVID-19.
PHAC data showed that as of May 13, 2021, a total of 740 COVID-19 infections had been reported in people who had received both doses of the vaccine.
The agency said 21%, or 153 of those cases were reported within seven days of the individual’s second dose.
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Seventy-nine percent – or 587 cases – were reported at least seven days after the individual received their second vaccine, which, according to the agency, reflects the “time taken to establish full immunity after two doses ”.
“The 587 cases with full immunity reported reflect 0.3% of the cases reported by the nine reporting jurisdictions since the start of vaccine deployment,” PHAC said.
The agency said of those cases for which additional information was available, 5.5% resulted in hospitalization and 3.5% resulted in death.
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Asked why Canada continues to suffer from infections after vaccination, Chagla said it was not “unreasonable to have revolutionary cases”.
“None of these vaccines (offer) 100% protection against symptomatic COVID-19,” he said. “And so we expect revolutionary cases.”
Chagla said that ultimately this was not the aim of the vaccination campaign.
“It is that (COVID-19) is becoming a manageable outpatient disease, that people are not hospitalized en masse,” he said.
He said the data helps give a “rough idea” of what is happening in the country among those who have been vaccinated.
He said it shows groundbreaking cases are happening, but “they’re much, much less likely than getting infected without a vaccine. “
US sees small number of revolutionary cases
On Tuesday, the U.S. Centers for Disease Control (CDC) released a report documenting what they called the “breakthrough” cases in those who had been fully vaccinated against COVID-19.
The CDC looked at cases between January 1, 2021 and April 30, 2021 and found that about 0.01% of people contracted the virus after a full vaccination.
The study found that a total of 10,262 vaccine-related infections had been reported as of April 30.
Meanwhile, the CDC said as of April 30, about 101 million people had been fully vaccinated.
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The center said, “Even though the vaccines authorized by the FDA are very effective, breakthrough cases are expected, especially before the immunity of the population reaches levels sufficient to further reduce transmission.”
The CDC added, however, that vaccine breakthrough case infections occur in “only a small fraction of all people vaccinated and represent a small percentage of all COVID-19 cases.”
How many vaccines have been administered in Canada?
As of Wednesday evening, 21,886,005 COVID-19 vaccines were administered across Canada.
This means that so far, 53.13% of Canadians have received at least one dose, according to Vaccine Tracker Canada.
In addition, a total of 1,743,718 people in Canada are now fully vaccinated, which means they have received two doses of a COVID-19 vaccine.
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