Â鶹´«Ã½

Coronavirus

    • Canada needs a stronger COVID-19 detection system, experts say

    Share

    Experts say Canada needs to develop a robust system to detect COVID-19 activity in the absence of wide-scale PCR testing.

    Since the onset of the Omicron variant, provinces and territories have scaled back access to gold-standard PCR testing, citing the lack of capacity to keep up with demand and the need to free up health-care resources.

    Many people have since relied on results from rapid antigen tests, but they aren't as reliable at detecting the Omicron variant or reported and tracked the way PCR tests are. Experts say there needs to be a better way of informing people about COVID-19 activity in their communities.

    Dr. Caroline Colijn, a mathematician and epidemiologist at Simon Fraser University, said there are currently "too many infections" in Canada to expand access to PCR tests to everyone to find out the true number of infections.

    She said more robust programs could also be used to pick up other kinds of respiratory infections.

    "And I suspect those are under development, but until they're developed, deployed, and results are publicly available, people will have trouble finding out what their risks are in their social group, in their community and in their workplace," she said.

    "So then they'll have trouble having the information needed to inform their own choices, their own workplace or community policies."

    Colijn said wastewater data is a really important source of information that can be publicly shared without compromising anyone's private medical data and can help communities understand the prevalence of COVID-19. But like PCR and rapid tests, she said it has its limitations.

    She noted there are numerous factors that could change wastewater signals, such as rainfall, temperature and different variants leaving different amounts of sequencing in the water, resulting in less accurate COVID-19 case estimates.

    Colijn said she anticipates an integrated system that would incorporate wastewater data, along with PCR and rapid test results, in a way that's designed to paint a more accurate picture of how much COVID-19 is in a population and inform people about the risk of contracting the virus.

    "So we do need to think about how to get representative samples, and how to understand how many infections are out there," she said.

    Dr. Dan Gregson, an infectious disease physician and medical microbiologist at the University of Calgary, said it would be reasonable to expand PCR testing access to certain settings like schools and long-term care homes in the event of an outbreak so they can make a decision on whether to close those institutions to prevent further transmission.

    However, he said the average person can rely on wastewater data to assess the risk of contracting COVID-19 in their community since it's "much more cost-effective" and "tells us similar information" to PCR testing.

    Dr. Peter Juni, scientific director of the Ontario COVID-19 Science Advisory Table, said it's "likely not sustainable" to expand access to PCR testing to all symptomatic individuals again because of the high cost of the tests.

    Juni noted that when PCR testing was available to all residents in Ontario, only somewhere between 30 and 45 per cent of infections were being detected because not everyone with the virus was getting tested. Some may have been asymptomatic, while others may not have had time to get tested., and still others may not have been getting tested early enough.

    As for rapid antigen tests available in Canada, he said they have shown "lower test performance" when it comes to detecting the Omicron variant.

    What's needed is a COVID-19 detection system that can use a random sample in a population "to try to understand what's actually happening and which can be ramped up if needed," Juni said.

    "If we see in wastewater, for instance, that infections start to increase, (then) we actually can really activate the system or extend it a bit, but it will be just a surveillance system that gives us enough situational awareness."

    This report by The Canadian Press was first published April 21, 2022.

    —â¶Ä”â¶Ä”

    This story was produced with the financial assistance of the Meta and Canadian Press News Fellowship.  

    ___

    What questions do you have about Omicron?

    With the emergence of a new COVID-19 variant of concern, labelled Omicron, CTVNews.ca wants to hear from Canadians with any questions.

    Tell us what you’d like to know when it comes to the Omicron COVID-19 variant.

    To submit your question, email us at dotcom@bellmedia.ca with your name, location and question. Your comments may be used in a CTVNews.ca story.

    CTVNews.ca Top Stories

    A team of tornado experts is heading to Fergus, Ont. after a storm ripped through the area Sunday night.

    Why brain aging can vary dramatically between people

    Researchers are uncovering deeper insights into how the human brain ages and what factors may be tied to healthier cognitive aging, including exercising, avoiding tobacco, speaking a second language or even playing a musical instrument.

    Canada

    • A team of tornado experts is heading to Fergus, Ont. after a storm ripped through the area Sunday night.

    • Two nephews of the beloved Harry R. Hamilton share stories about his life and legacy.

    • The union representing some 1,200 dockworkers at the Port of Montreal has overwhelmingly rejected a deal with their employers association.

    • A man who was critically injured in a police-involved shooting in Hamilton late Sunday afternoon has died in hospital, says the province’s police watchdog.

    World

    Politics

    • Murray Sinclair’s family members say the late justice and senator has been laid to rest according to his wishes.

    • Prime Minister Justin Trudeau announced voters in Cloverdale—Langley City will pick their next member of Parliament on Dec. 16.

    Health

    Sci-Tech

    Entertainment

    Business

    Lifestyle

    Sports

    Autos

    Local Spotlight

    For the second year in a row, the ‘Gift-a-Family’ campaign is hoping to make the holidays happier for children and families in need throughout Barrie.

    Some of the most prolific photographers behind CTV Skywatch Pics of the Day use the medium for fun, therapy, and connection.

    A young family from Codroy Valley, N.L., is happy to be on land and resting with their newborn daughter, Miley, after an overwhelming, yet exciting experience at sea.

    As Connor Nijsse prepared to remove some old drywall during his garage renovation, he feared the worst.

    A group of women in Chester, N.S., has been busy on the weekends making quilts – not for themselves, but for those in need.

    A Vancouver artist whose streetside singing led to a chance encounter with one of the world's biggest musicians is encouraging aspiring performers to try their hand at busking.

    Ten-thousand hand-knit poppies were taken from the Sanctuary Arts Centre and displayed on the fence surrounding the Dartmouth Cenotaph on Monday.

    A Vancouver man is saying goodbye to his nine-to-five and embarking on a road trip from the Canadian Arctic to Antarctica.

    • LIVE

      LIVE

      Thousands of people are gathered in downtown Vancouver to observe the city’s 100th Remembrance Day ceremony.

    • A suspect was arrested for allegedly brandishing a knife outside a Vancouver elementary school on Friday – just as the young students were heading home for the day.

    • The federal government is urging both sides in the British Columbia port dispute to return to the table after mediated talks broke off on Saturday, the first of three scheduled days.

    • Several hundred people gathered outside the Ontario legislature in Toronto to honour veterans and remember those who died fighting for their country.

    • Toronto is expected to see an economic boost to the tune of nearly $300 million thanks to Taylor Swift’s upcoming Eras Tour, which will be making a stop in Canada’s largest city for a six-show run later this month.

    • A man believed to be in his 40s has been rushed to a trauma centre following a stabbing in downtown Toronto.

    • Calgarians will be observing Remembrance Day at a number of different ceremonies across the city, including at the Hangar Flight Museum.

    • July 2025 may seem like it’s in the distant future, but for the St. Luke playground committee time is ticking to fundraise the $340,000 they still need to build a new playground.

    • Getting out to the mountains is even easier with a new bus route from a growing Germany-based service.

    • Crowds gathered in Ottawa and eastern Ontario on Monday to honour the sacrifice of men and women in uniform who gave their lives in service of Canada.

    • CTVNewsOttawa.ca looks at Remembrance Day ceremonies in Ottawa.

    • After months of controversy surrounding a dog park in Ottawa's west end, a solution has been reached to divide the park in half.

    • A 36-year-old Montreal man who was out on bail after allegedly uttering death threats to a woman is now accused of murdering her on the South Shore.

    • With fewer interments and rising maintenance fees, the money for Canada's largest military cemetery will run out in three to four years.

    • Montreal Metro passengers can now flag a safety concern by texting a new phone number launched by the STM.

    • A member of Canadian Forces Base (CFB) Edmonton participated in the national Remembrance Day Ceremony in Ottawa on Monday.

    • WEATHER

      WEATHER

      This is shaping up to be one of the warmest Remembrance Days in the past decade, at least, for temperatures.

    • Thousands of Maritimers turned out in wet weather Monday to remember those who have served, and continue to serve, in Canada's armed forces for Remembrance Day.

    • A Cape Breton senior recalls her life in German-occupied France, and her mother’s death, during the Second World War.

    • Thousand of people gathered at the Menin Gate in the Ypres, Belgium for Monday’s Remembrance Day Ceremony.

    • Remembrance Day is today, and a number of ceremonies are taking place around the province to honour those who gave their lives to serve our country.

    • A pillar in Canada’s history was honoured in Winnipeg Sunday afternoon, with thousands showing up to pay tribute to the life and legacy of the late Murray Sinclair.

    • One Manitoba veteran is on a mission to commemorate and honour those who served our country, and not just on Remembrance Day.

    • There will be two ceremonies taking place in Regina for Remembrance Day, hosted by the Royal Canadian Legion.

    • Regina author Valerie Crowther is celebrating the release of her book ‘War Letters: Linking Lives in the Second World War.’

    • It was a somber day at Mosaic Stadium as members of the Saskatchewan Roughriders officially cleaned out their stalls and closed the book on the 2024 season.

    • Saskatchewan RCMP are searching for a suspect after a man was seriously injured in a farm-related incident in Montreal Lake.

    • It was a somber day at Mosaic Stadium as members of the Saskatchewan Roughriders officially cleaned out their stalls and closed the book on the 2024 season.

    • The Regina Rams claimed the Hardy Cup after a hard fought battle against the Saskatoon Huskies 19-14 on Saturday in the first all Saskatchewan U-Sports western conference final since 2002.

    • Emergency crews responded to the scene on Road 68/Highway 2 east of Thamesford around 7 p.m.

    • The events will start at 10:15 a.m. with a parade that forms up in front of the Delta London Armories, marches east on Dundas Street and turns north onto Waterloo Street to Dufferin Avenue, the west to the Cenotaph.

    • A team of tornado experts is heading to Fergus, Ont. after a storm ripped through the area Sunday night.

    • A Barrie man is at the centre of an alleged $2.2 million stolen used car scheme.

    • Environment Canada issued a weather alert for Barrie, Collingwood and surrounding areas, alerting residents about the wicked winds that are expected to pick up to 80 kilometres per hour in the afternoon hours.

    • Barrie residents gathered on Monday to honour Canada’s veterans and pay tribute to those who served and sacrificed for the country.

    • Representatives of the Windsor Veterans Memorial Services Committee, military representatives, wreath bearers, government officials, and members of the public will attend the Cenotaph at City Hall Square for the outdoor service.

    • Windsor Paralympic champion, Danielle Campo, has been crowned the number one Inspirational Speaker of the Year for 2024 at the Inspirational Speaking Finals.

    • One person has been arrested after Chatham-Kent Police Service (CKPS) received multiple complaints about an alleged drunk driver.

    • Environment Canada says heavy rain and winds could cause power outages on Vancouver Island as an "intense" storm system is set to hit the B.C. coast Sunday.

    • Six deer were struck by vehicles in six different locations in a six-hour period on B.C. highways on Saturday, according to the transportation ministry.

    • The union for locked-out port workers in British Columbia says the BC Maritime Employers Association cut off talks in less than an hour Saturday, refusing to budge on a final offer that the union has so far rejected.

    • The emergency department at South Okanagan General Hospital in Oliver, B.C., will be closed for 31 hours this weekend, the second such closure in a week and the third since the start of November.

    • Police in Kamloops, B.C., are reminding parents and guardians to check their children's Halloween candy after receiving a report of a mother finding a razor blade in one of her daughter's treats.

    • More than two years after Alannah Brown and Douglas Barker were found dead north of Penticton, police are asking for help identifying a vehicle they believe was associated with the crime.

    • The Southern Alberta Recreation Association is officially announcing the Town of Taber as next year’s host for the Southern Alberta Summer Games.

    • The Lethbridge Hurricanes broke open a close game with three goals in the first two minutes of the third period as they defeated the Warriors 7-3 in a game played Friday night in Moose Jaw.

    • There might not a lot snow just yet, but many southern Albertans are still itching to get outdoors.

    • It was just days before the COVID-19 pandemic shut the world down when the Shaft Bottom Boys of Sudbury broke a world record for 'Deepest Concert Underground.' Now, more than four years later, a Timmins band is looking to take the title.

    • Police say that a 16-year-old was attacked with a sword Nov. 3 in Cobalt, Ont., in a case of intimate partner violence.

    • Police have arrested a 15-year-old in connection with a break-in and $50,000 in damage done to the Centennial Arena in Elliot Lake in September.

    N.L.

    Shopping Trends

    The Shopping Trends team is independent of the journalists at Â鶹´«Ã½. We may earn a commission when you use our links to shop. Read about us.

    Stay Connected
    Follow Â鶹´«Ã½