Canada is headed towards a fourth wave of COVID-19 infections, but how severe of a resurgence it鈥檒l be depends on how many people are fully vaccinated, warns new national modelling released Friday.
The country is seeing an increase in new COVID-19 cases, and thousands more infections are predicted if contacts aren鈥檛 contained, the modelling indicates.
The new picture on Canada鈥檚 pandemic trajectory shows the serious threat the highly-contagious Delta variant is posing, and the risk that the unvaccinated may be to the country being thrust into a fourth wave of the disease.
鈥淭he updated longer-range forecast shows how the epidemic trajectory may evolve through early September. It suggests that we are at the start of the Delta-driven fourth wave, but that the trajectory will depend on ongoing increases in fully vaccinated coverage, and the timing, pace and extent of reopening,鈥 Chief Public Health Officer Dr. Theresa Tam said.
After weeks of sustained decline in new cases, the Public Health Agency of Canada is warning that if community-wide contact rates increase too quickly with ongoing reopening efforts, the long-term forecast indicates Canada could experience a 鈥渟tronger resurgence鈥 of the virus.
Ultimately, factoring in the spread of Delta, hospital capacity could be exceeded this fall or winter if more people don鈥檛 get vaccinated, the modelling indicates.
The predominance of the Delta variant 鈥渦nderscores the need for high vaccination coverage and continued caution as restrictions are eased,鈥 the modelling states.
The Public Health Agency of Canada's aim is to see as many eligible Canadians vaccinated this summer as possible. As of midday Friday, 80.5 per cent of those eligible have received a first dose, while 65.8 per cent of those eligible are now fully vaccinated.
鈥淚f we can get to 90 [per cent vaccinated], I鈥檒l be popping over the champagne for sure,鈥 Tam said.
The new data predicts that in the short-term, the case count will continue to increase, meaning the country could see between 2,700 and 11,800 new cases over the next week or so. As of midday Friday, there have been 1,429,937 reported cases nationwide, and by Aug. 8 that number could grow to between 1,432,555 to 1,441,610 cases.
One sign that Canada鈥檚 case counts are on an upward trajectory: the national 鈥淩t鈥 or effective reproduction number, recently started trending above one around mid-July, meaning there are 鈥渆arly signs of epidemic growth鈥 in some regions. This comes after the 鈥淩t鈥 had remained out of a growth pattern since April.
鈥淚f the 鈥楻t鈥 remains persistently above one for several weeks, with the predominance of the highly contagious Delta variant, we could expect to see a return to rapid epidemic growth, particularly as measures that slow the spread are eased,鈥 said Tam.
PHAC says it saw a five-fold increase in the proportion of Delta cases in June, reminding that Delta cases have an increased risk for hospitalization, and has reduced vaccine effectiveness against a symptomatic infection. Further, the majority of the Delta cases in Canada are in those who are unvaccinated, or are partially vaccinated.
鈥淧eople seem to be, in certain areas, tired and forgetting about science, which is unfortunate,鈥 said Dr. Lisa Barrett, an infectious disease expert and assistant professor at Dalhousie University in Halifax, in an interview on 麻豆影视 Channel.
鈥淲e know at this point that we are going to live with the virus鈥 however we don't have enough data, information, vaccination, ways to treat this virus鈥 we don鈥檛 have enough of that knowledge yet to expect to treat this just like another respiratory virus,鈥 she continued.
In an indication that the vaccines are working, the modelling does not anticipate the rate of new deaths to increase along with the uptick in new cases.
The modelling shows that regionally, hospitalization rates remain low, with fewer than one per cent of reported cases and fewer than one per cent of hospitalized cases occurring in people who are fully vaccinated.
The flipside of this statistic though, is that 89.7 per cent of all cases are occurring in eligible, but unvaccinated people, and 84.9 per cent of hospitalized cases are people who are unvaccinated. Another 5.3 per cent of cases are in those who are not yet eligible for vaccines, and 4.6 per cent of infections are in those who are partially vaccinated.
Tam said it鈥檚 also mostly those who are unvaccinated who are dying after contracting COVID-19.
The federal health officials are now pushing to see a marked increase in vaccination rates in younger populations, warning that if they don鈥檛 increase in the coming months, Canada could face a 鈥渟erious resurgence鈥 this fall or winter.
Deputy Chief Public Health Officer Dr. Howard Njoo called out the approximately 6.3 million eligible Canadians who have yet to roll up their sleeves and get vaccinated.
鈥淲hat are you waiting for?鈥 said Njoo. 鈥淭his is all very preventable if people go forward and get vaccinated, so let's go for it. Let's go.鈥
Generally speaking, the rate of vaccination decreases in each younger demographic. During the early stages of the rollout, older generations were often prioritized for vaccination ahead of younger ones.
As of last week the percentages in each age group who are fully vaccinated are:
The data also breaks down how each province stacks up on vaccination rates, with Newfoundland and Labrador, Prince Edward Island, and Alberta still having the farthest to go in terms of fully vaccinating its eligible population, while the Yukon and Northwest Territories continue to lead the nation in vaccination rates.
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