Alberta COVID-19 wastewater readings increase as subvariant now dominant strain

Wastewater readings in Alberta are trending up, indicating new COVID-19 infections are rising amid the Omicron subvariant BA.2 becoming the dominant strain of the disease in the province.

Those higher readings mirrortrends across Canadaand arecentrise in global COVID-19 cases.

Alberta datafrom adashboard createdby the University of Calgary Centrefor Health Informatics shows the average amount of COVID-19 detected in wastewater.

Kevin Frankowski, the executive director ofAdvancing Canadian Wastewater Assets (ACWA) at the University of Calgary, said the amount of virus circulating in the community is staying relatively high.

"Based upon the wastewater numbers, it's clear that COVID isn't over yet. We're not out of the woods yet," he said. "It's important to remain vigilant."

Numbers during the Omicron wave were much higher than they are currently,but the dashboard's last three data points have tracked an increase in levels after staying relatively stable for some time.

Despite that,Frankowski said, hospitalization numbers keep coming down.The number of people in hospital was down 10 from Friday, for a total of 945. The number of Albertans in the ICU also went down, from 62 to 56.

"So that means whatever virus, whatever variant of the virus is circulating now, BA.2, causes less severe health outcomes," he said. "But it's still very prevalent."

Frankowski said Edmonton looks similar to Calgary in recent days, though numbers have bounced around more and have not shown the same consistent increase seen in Calgary.

More transmissible variant

Wastewater testing, along with hospitalizations, are among the best tools availableto illustrate how much virus is circulating around the country amid the collapse of COVID-19 testing.

COVID-19 public health restrictions have been loosening across Canada in recent weeks, with Alberta liftingnearly all of itsrestrictions three weeks ago.

The province has alsoreduced reporting on COVID-19 numbers toonce a week,instead of every weekday.

Speaking at Wednesday's update, Dr. Deena Hinshaw, the province's chief medical officer of health, said that thoughBA.2 ismore transmissible than BA.1, so far there is no evidence of it causing more severe disease.

COVID-19 cases surge in Asia, Europe as public health measures relax

2 years ago

Duration 4:18

Figures showing a global rise in COVID-19 cases are 'just the tip of the iceberg,' says the director general of the World Health Organization, blaming the increase on the BA.2 subvariant, easing public health measures and low vaccination rates in some countries.

However, Hinshaw added that more transmissible variants can still have a large impact on populations.

"Those at risk of severe outcomes should revisit their precautionary measures," she said.

Twenty-one more deaths were reported on Wednesday since the previous update on Friday, bringing the total number of Albertans who have died from COVID-19 to 4,044. That number is current up to end of day Monday.

Lynora Saxinger, an infectious disease specialist at the University of Alberta, said the rise in wastewater numbers is not unexpectedbut is a bit of a caution flag.

"The trend is something that's concerning, and it's kind of unpredictable as well. And, again, then the number of infections in the community are going up based on that," she said.

Frankowski said it will be important to monitor the data and continue to take personal responsibility for one's health.

"This virus isn't going away, right? We're not going to get back to pre-COVID times," he said. "But maybe it gets to the point where it's more manageable."