Getting infected twice with two different Omicron coronavirus subvariants is possible, but rarely happens, a Danish study has found.
In Denmark, a more infectious sublineage of the Omicron coronavirus variant known as BA.2 has quickly dethroned the "original" BA.1 variant, which is the most common worldwide, but it has remained unclear whether a person could get infected by both variants.
A , led by researchers at Denmark's top infectious disease authority, Statens Serum Institut (SSI), shows that people infected with BA.1 can get infected with BA.2 shortly afterwards, but that it is a rare occurrence.
"We provide evidence that Omicron BA.2 reinfections are rare but can occur relatively shortly after a BA.1 infection," the study authors said.
BA.1 and BA.2 differ by up to 40 mutations. While BA.2 accounts for more than 88 per cent of cases in Denmark, cases have started to increase in the United Kingdom, South Africa and Norway.
The reinfections mostly affected young, unvaccinated individuals and only caused mild disease, none of which led to hospitalizations or deaths, the researchers added.
The study, which is not yet peer-reviewed, found 1,739 cases registered between Nov 21, 2021, and Feb 11 this year, where people had tested positive twice between 20 and 60 days apart.
In that period more than 1.8 million infections were registered in Denmark.
From a smaller sample group, the study found 47 instances of BA.2 reinfections shortly after a BA.1 infection. The researchers also detected less virus material at the second infection, suggesting some immunity was developed from the first infections.
In part three of a four-part investigation into the seedy underbelly of the lucrative clothing donation bin industry, CTV W5's Jon Woodward and Joseph Loiero look into allegations that the industry is rife with organized crime activity.
Canada will lower the number of permanent immigrants it allows into the country by at least 20 per cent from its previous target of 500,000, 愛污传媒 confirmed Wednesday.
Montreal Mayor Valerie Plante announced Wednesday she would not seek a third mandate. Her decision has many talking about the demands of municipal leadership, particularly for women.
The president and CEO of New Brunswick-based Covered Bridge Potato Chips is taking an 'extended leave of absence' after being charged with domestic violence this past weekend.
A memorial is growing outside a Walmart in Halifax after a 19-year-old employee was found dead inside an oven in the store Saturday night.
Prime Minister Justin Trudeau says the Liberal party is 'strong and united,' despite efforts from within his caucus to oust him as leader.
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Abousfian Abdelrazik told a court Wednesday about the roller-coaster of emotions he experienced during the tense days of early 2009 when he awaited the green light to return to Canada from Sudan.
Speed was a possible factor in a Tuesday night rollover involving a semi-truck that left 17 cows dead. In a news release Wednesday, Calgary police said officers were called to the area of Stoney Trail S.E. and Macleod Trail S.E. around 8:10 p.m. for a reported rollover involving a semi-truck carrying 95 cattle.
A Real Canadian Superstore in B.C.'s Fraser Valley was evacuated Tuesday night due to a "suspicious" fire in the toilet paper aisle, according to authorities.
The president and CEO of New Brunswick-based Covered Bridge Potato Chips is taking an 'extended leave of absence' after being charged with domestic violence this past weekend.
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Trash carried by a North Korean balloon fell on the presidential compound in central Seoul on Thursday, officials said, the second such case in recent months that raise concerns about the vulnerability of key South Korean sites during potential North Korean aggression.
Turkiye鈥檚 air force struck Kurdish militant targets in Iraq and Syria on Wednesday in apparent retaliation for an attack at a key state-run defence company that killed five people and wounded more than a dozen others.
The Justice Department warned Elon Musk鈥檚 America PAC in recent days that his US$1 million sweepstakes to registered voters in swing states may violate federal law, people briefed on the matter told CNN.
If you鈥檙e a regular visitor to Walt Disney World, your annual passes are going to cost you more. The resort in Orlando, Fla., hiked prices on all four levels of its passes on Wednesday.
Three people were found dead Wednesday and four others were hospitalized after an 'unexplained' incident at a care home in southern England, police said.
The U.S. said Wednesday that 3,000 North Korean troops have deployed to Russia and are training at several locations, calling the move very serious and warning that those forces will be 'fair game' if they go into combat in Ukraine.
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Prime Minister Justin Trudeau says the Liberal party is 'strong and united,' despite efforts from within his caucus to oust him as leader.
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McDonald鈥檚 worked Wednesday to reassure customers that its U.S. restaurants are safe as federal investigators tried to pinpoint the cause of a deadly E. coli outbreak linked to the fast-food giant's Quarter Pounder hamburgers.
A quick shake of the head after a hard hit could signal that a person has a concussion, a new study suggests, based on the experiences of young athletes.
A recall has been issued for certain clothing items sold at Giant Tiger stores over high levels of lead, according to a notice published by Health Canada Tuesday.
Vancouver Fire Rescue Services received its first shipment of new firefighting gear on Wednesday, advancing the department's plans to reduce cancer risk for its members.
Officials in Hong Kong said Wednesday they have discovered dinosaur fossils in the city for the first time on a remote, uninhabited island that's part of a geopark.
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Ron Ely, who played the title character 'Tarzan' in the 1960s NBC series, has died at the age of 86.
Cardi B says she has been hospitalized with a medical emergency and will have to miss a Saturday night headlining performance at an Atlanta music festival.
Almost three years after the deadly Astroworld Festival tragedy, Houston rapper and concert headliner Travis Scott just settled hundreds of lawsuits related to the case.
Canada's discount airline is suspending operations to and from Saskatoon.
Things could be looking up for Waterloo, Ont.-based company and former tech darling Sandvine, after being removed from the U.S. Department of Commerce Entity List earlier this week.
Starbucks Corp suspended its forecast through the next fiscal year as new CEO Brian Niccol looks to turn around the coffee giant struggling with falling demand for its pricey drinks.
A new resident at a Manitoba animal rescue has waddled her way into people's hearts.
Grab your passport and your sunscreen, Lonely Planet has just revealed its 30 must-visit destinations for 2025 as well as a brand-new rundown of top 10 travel trends.
The Radium Hot Springs in British Columbia's Kootenay National Park has undergone a $29-million makeover.
An 18-year-old has filed a lawsuit over the ownership of the ball Shohei Ohtani made baseball history with when he became the inaugural member of the 50-50 club.
Evan Mobley had 25 points and eight rebounds to lead the Cleveland Cavaliers to a 136-106 rout in Toronto's home opener on Wednesday as the Raptors also lost starting point guard Immanuel Quickley.
Former 'Malcolm in the Middle' star Frankie Muniz is set to continue his NASCAR career with a full-time ride in the Truck Series for 2025.
An increased risk of fire has prompted the recall of thousands of Honda hybrid vehicles in Canada.
A senior executive for Volkswagen in China has been deported for allegedly using cocaine and marijuana while on vacation in Thailand, according to Chinese authorities and German media reports.
The U.S. government's road safety agency is investigating Tesla's 'Full Self-Driving' system after getting reports of crashes in low-visibility conditions, including one that killed a pedestrian.
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Residents of Ottawa's Rideauview neighbourhood say an aggressive wild turkey has become a problem.
A man who lost his life while trying to rescue people from floodwaters, and a 13-year-old boy who saved his family from a dog attack, are among the Nova Scotians who received a medal for bravery Tuesday.
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A Springfield, Ont. man is being hailed a 'hero' after running into his burning home to save his two infant children.
Hortense Anglin was the oldest graduate to make her way across the platform at York University's Fall Convocation ceremony this week. At the age of 87, she graduated with an Honours degree in Religious Studies.
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The image of a sleepy Saskatchewan small town with 'not a lot going on' is a well-known anecdote. However, one Saskatchewan company is hoping to change that 鈥 and allow communities both on and off the beaten path to share their stories and advertise what they have to offer.
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Nigel Berkley and CRARR plan to file complaints with the police ethics commissioner and the human rights commission after Berkley was repeatedly stopped while driving his mother's car over four months.
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A Manitoba inmate who was released from custody by mistake has been arrested, according to Winnipeg police.
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Southey RCMP say drivers should expect delays on Highway 6 Wednesday night after a serious crash.
Regina police says officers will provide an update Thursday in its search for the suspect of a homicide that took place in the city during the summer of 2023.
Detective Robert Hofstetter examined Erb鈥檚 home after her death and came to several conclusions based on the blood stains he found there.
A psychologist who recently assessed Geovanny Villalba-Aleman believes he may have experienced a psychotic break before stabbing three people in a gender studies class at a University of Waterloo.
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Canada's discount airline is suspending operations to and from Saskatoon.
The Saskatoon civic election is drawing closer, with mayoral candidates outlining their visions to keep the city competitive and attract businesses.
A Sudbury jury has found Felicity Altiman guilty of second-degree murder in the December 2020 stabbing death of a Sudbury man.
It only took minutes for North Bay pharmacist Brian Chute to be out $1,500 after fraudsters deceptively swapped his bank card with another.
The president and CEO of New Brunswick-based Covered Bridge Potato Chips is taking an 'extended leave of absence' after being charged with domestic violence this past weekend.
More cancer-fighting isotopes will be produced by Bruce Power thanks to a new partnership between Bruce Power, the Saugeen Ojibway Nation, and two international partners.
Under tough cross-examination at the London courthouse on Wednesday, Rachel Johnson, 21, was asked a number of times why there was a delay in calling 911
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A haunted house in the Town of Innisfil is causing a real scare for some people a week before Halloween.
Barrie police conducted a search on Wednesday of the last place Autumn Shaganash was seen in hopes of giving her family some answers to her mysterious disappearance.
A 34-year-old motorcyclist has died following a collision in Barrie鈥檚 south end on Tuesday.
The Windsor Jewish Federation responded on Wednesday evening to a decision by the board of governors for the University of Windsor concerning its agreements with pro-Palestinian protesters.
Windsor Fire and Rescue Services has been working to prepare for heightened HAZMAT risk ahead of relaxed restrictions around the transportation of some hazardous materials across the Ambassador Bridge.
As hospitals elsewhere in Ontario reintroduce mask mandates due to rising respiratory illnesses, Windsor hospitals are taking a more measured approach.
Two B.C. RCMP officers won鈥檛 face criminal charges for their use for force that left a man who had been arrested for public intoxication with a concussion, a torn shoulder and a chunk of his hair missing 鈥 but they could face professional discipline.
When 16-year-old Kaydence Bourque was struck and killed in a crosswalk on Cedar Hill Cross Road in Saanich in 2021, the community was shaken to the core.
A man who fired at least 19 gunshots at an RCMP detachment in northern British Columbia, narrowly missing officers inside, has won a reduced prison sentence from the province's highest court, which ruled the sentencing judge failed to fully weigh the man's mental illness at the time.
Dave Lindsey began growing giant pumpkins to bring a bit of magic to his grandkids' Halloween.
A U.S. District Court judge in Montana has sentenced a 27-year-old man from Kelowna, B.C., to 18 months in prison for using fake names to buy guns with the aim of selling them in Canada.
Nearly two years after a man was stabbed to death in downtown Kelowna, RCMP have made an arrest in the case.
Graduate students looking to become mental-health professionals will have more opportunities to study in the University of Lethbridge鈥檚 Master of Education Counselling Psychology program.
A dazzling light display is making its return to Lethbridge this holiday season.
As part of anniversary celebrations, the City of Lethbridge is inviting the community to see VisitLethbridge.com Arena like they never have before.
The lack of 24-hour public washrooms has been a long-standing issue in the Sault, especially considering the rise in homelessness.
The union representing the fire rangers with the Ministry of Natural Resources says money won鈥檛 fix the systemic problems in the workplace.
Rallies by a group called Voices Against Violence took place across the country on Monday, including Sault Ste. Marie.
Investigators found the remains of a 77-year-old American man on Wednesday at the scene of a fire that destroyed a hotel in western Newfoundland earlier on the weekend.
Police in western Newfoundland say a 77-year-old man visiting the province from Kansas is missing after a fire at a hotel in Deer Lake, N.L.
At 2 p.m. on Thursday, the scene at the Lions Club in Clarenville, N.L., rivalled any rowdy St. John's bar that thumps with music late on a weekend night.
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