Covid-positive deer may be harboring the virus and infecting humans, study says - Salon | Canada News Media
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Covid-positive deer may be harboring the virus and infecting humans, study says – Salon

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Aside from saving human lives in the immediate moment, the other fundamental reason that public health officials were pushing mass vaccination to slow the spread of COVID-19 is because the more hosts in which a virus resides, the more likely the virus is to eventually mutate into something more virulent. Obviously, that has happened at least twice so far with SARS-CoV-2: first with the ultra-contagious delta variant, and then later with the even more contagious omicron variant

Currently, the number of human hosts in the U.S. is waning as the omicron wave falls from its peak. If we are lucky, that may imply that this wave of infections is over, and while the coronavirus will continue to circulate (and mutate) as it becomes endemic, it would have fewer hosts in which to do so. 

Or, at least human hosts. As we know, SARS-CoV-2 seems to have circulated in bats and pangolins before crossing over to humans. We also know that the virus spread back into animals, presumably through humans: dogscats, a zoo lion, and a large population of deer appear to have been infected by humans.

Ominously, the infection trend may now be going the other way. A recent Canadian study raises the possibility that deer — one of the most ubiquitous large mammals in North America — may have infected humans with COVID-19, the disease caused by SARS-CoV-2. That would imply the virus circulated for a while in deer, reproducing and occasionally mutating on its way, before jumping back into people.

RELATED: From deer and dogs to rats and mink, COVID-19 has spread to the animal world

The new study provides evidence that deer may have infected humans, although it is not definitively proven. Conducted by more than two dozen scientists across Ontario and posted on the database bioRxiv (it has not yet been peer reviewed), the study included 300 samples from white-tailed deer in Canada during the final months of 2021. Seventeen of those deer tested positive for SARS-CoV-2, all of them from southwestern Ontario. The scientists discovered that this same strain of SARS-CoV-2, which is highly divergent from other known strains, was also highly similar to a SARS-CoV-2 virus that had infected a human. (It was also closely related to a strain found among humans in Michigan in late 2020.) While the scientists cannot confirm that the virus had been transmitted to the human by a deer, they know that the human lived in the same geographic area as deer and had been in close contact with deer during the same time when the infected samples were collected.


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That said, the sample size is very small and no one has definitively proved that the deer gave the virus to the human. There is also no evidence that the person with the mutant SARS-CoV-2 virus passed it on to anyone else, and initial experiments suggests the new virus would not be able to evade antibodies. In other words, if it did spread among people, individuals who are vaccinated would likely be safe.

Finally, because the deer-based SARS-CoV-2 virus is such an unknown, there is no reason to believe yet that it presents any kind of increased risk to humans. The bigger concern is that, because viruses can evolve in animals, there is the possibility that it could turn into something more dangerous.

“The virus is evolving in deer and diverging in deer away from what we are clearly seeing evolving in humans,” Samira Mubareka, a virologist at Sunnybrook Research Institute and the University of Toronto and an author of the new paper, told The New York Times. After fully sequencing the genomes from five of the infected deer, the scientists discovered many mutations that had not been previously documented. They also found 76 mutations that set the new version of SARS-CoV-2 from the original version of the virus. Some of those mutations had been previously discovered in other infected animals like mink.

Shortly before this study was published, a separate group of scientists announced that Pennsylvania deer may have continued to be infected with the Alpha variant even after it disappeared in humans — and that it evolved within them as they continued to spread it. This further reinforces the concern about deer incubating SARS-CoV-2 viruses.

The SARS-CoV-2 virus is believed to have originated in in a horseshoe bat. At some point, the virus is thought to have been transmitted to another animal through one or many “spillover events,” and then eventually found its way to a human host. Bats are notorious for serving as hosts to dangerous coronaviruses because their immune systems are unusually aggressive. This means that viruses which live in bats need to evolve and replicate more quickly in order to survive.

“The bottom line is that bats are potentially special when it comes to hosting viruses,” Mike Boots, a disease ecologist and UC Berkeley professor of integrative biology, told Science Daily in 2020. “It is not random that a lot of these viruses are coming from bats. Bats are not even that closely related to us, so we would not expect them to host many human viruses. But this work demonstrates how bat immune systems could drive the virulence that overcomes this.”

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Canada to donate up to 200,000 vaccine doses to combat mpox outbreaks in Africa

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The Canadian government says it will donate up to 200,000 vaccine doses to fight the mpox outbreak in Congo and other African countries.

It says the donated doses of Imvamune will come from Canada’s existing supply and will not affect the country’s preparedness for mpox cases in this country.

Minister of Health Mark Holland says the donation “will help to protect those in the most affected regions of Africa and will help prevent further spread of the virus.”

Dr. Madhukar Pai, Canada research chair in epidemiology and global health, says although the donation is welcome, it is a very small portion of the estimated 10 million vaccine doses needed to control the outbreak.

Vaccine donations from wealthier countries have only recently started arriving in Africa, almost a month after the World Health Organization declared the mpox outbreak a public health emergency of international concern.

A few days after the declaration in August, Global Affairs Canada announced a contribution of $1 million for mpox surveillance, diagnostic tools, research and community awareness in Africa.

On Thursday, the Africa Centres for Disease Control and Prevention said mpox is still on the rise and that testing rates are “insufficient” across the continent.

Jason Kindrachuk, Canada research chair in emerging viruses at the University of Manitoba, said donating vaccines, in addition to supporting surveillance and diagnostic tests, is “massively important.”

But Kindrachuk, who has worked on the ground in Congo during the epidemic, also said that the international response to the mpox outbreak is “better late than never (but) better never late.”

“It would have been fantastic for us globally to not be in this position by having provided doses a much, much longer time prior than when we are,” he said, noting that the outbreak of clade I mpox in Congo started in early 2023.

Clade II mpox, endemic in regions of West Africa, came to the world’s attention even earlier — in 2022 — as that strain of virus spread to other countries, including Canada.

Two doses are recommended for mpox vaccination, so the donation may only benefit 100,000 people, Pai said.

Pai questioned whether Canada is contributing enough, as the federal government hasn’t said what percentage of its mpox vaccine stockpile it is donating.

“Small donations are simply not going to help end this crisis. We need to show greater solidarity and support,” he said in an email.

“That is the biggest lesson from the COVID-19 pandemic — our collective safety is tied with that of other nations.”

This report by The Canadian Press was first published Sept. 13, 2024.

Canadian Press health coverage receives support through a partnership with the Canadian Medical Association. CP is solely responsible for this content.

The Canadian Press. All rights reserved.

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How many Nova Scotians are on the doctor wait-list? Number hit 160,000 in June

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HALIFAX – The Nova Scotia government says it could be months before it reveals how many people are on the wait-list for a family doctor.

The head of the province’s health authority told reporters Wednesday that the government won’t release updated data until the 160,000 people who were on the wait-list in June are contacted to verify whether they still need primary care.

Karen Oldfield said Nova Scotia Health is working on validating the primary care wait-list data before posting new numbers, and that work may take a matter of months. The most recent public wait-list figures are from June 1, when 160,234 people, or about 16 per cent of the population, were on it.

“It’s going to take time to make 160,000 calls,” Oldfield said. “We are not talking weeks, we are talking months.”

The interim CEO and president of Nova Scotia Health said people on the list are being asked where they live, whether they still need a family doctor, and to give an update on their health.

A spokesperson with the province’s Health Department says the government and its health authority are “working hard” to turn the wait-list registry into a useful tool, adding that the data will be shared once it is validated.

Nova Scotia’s NDP are calling on Premier Tim Houston to immediately release statistics on how many people are looking for a family doctor. On Tuesday, the NDP introduced a bill that would require the health minister to make the number public every month.

“It is unacceptable for the list to be more than three months out of date,” NDP Leader Claudia Chender said Tuesday.

Chender said releasing this data regularly is vital so Nova Scotians can track the government’s progress on its main 2021 campaign promise: fixing health care.

The number of people in need of a family doctor has more than doubled between the 2021 summer election campaign and June 2024. Since September 2021 about 300 doctors have been added to the provincial health system, the Health Department said.

“We’ll know if Tim Houston is keeping his 2021 election promise to fix health care when Nova Scotians are attached to primary care,” Chender said.

This report by The Canadian Press was first published Sept. 11, 2024.

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Newfoundland and Labrador monitoring rise in whooping cough cases: medical officer

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ST. JOHN’S, N.L. – Newfoundland and Labrador‘s chief medical officer is monitoring the rise of whooping cough infections across the province as cases of the highly contagious disease continue to grow across Canada.

Dr. Janice Fitzgerald says that so far this year, the province has recorded 230 confirmed cases of the vaccine-preventable respiratory tract infection, also known as pertussis.

Late last month, Quebec reported more than 11,000 cases during the same time period, while Ontario counted 470 cases, well above the five-year average of 98. In Quebec, the majority of patients are between the ages of 10 and 14.

Meanwhile, New Brunswick has declared a whooping cough outbreak across the province. A total of 141 cases were reported by last month, exceeding the five-year average of 34.

The disease can lead to severe complications among vulnerable populations including infants, who are at the highest risk of suffering from complications like pneumonia and seizures. Symptoms may start with a runny nose, mild fever and cough, then progress to severe coughing accompanied by a distinctive “whooping” sound during inhalation.

“The public, especially pregnant people and those in close contact with infants, are encouraged to be aware of symptoms related to pertussis and to ensure vaccinations are up to date,” Newfoundland and Labrador’s Health Department said in a statement.

Whooping cough can be treated with antibiotics, but vaccination is the most effective way to control the spread of the disease. As a result, the province has expanded immunization efforts this school year. While booster doses are already offered in Grade 9, the vaccine is now being offered to Grade 8 students as well.

Public health officials say whooping cough is a cyclical disease that increases every two to five or six years.

Meanwhile, New Brunswick’s acting chief medical officer of health expects the current case count to get worse before tapering off.

A rise in whooping cough cases has also been reported in the United States and elsewhere. The Pan American Health Organization issued an alert in July encouraging countries to ramp up their surveillance and vaccination coverage.

This report by The Canadian Press was first published Sept. 10, 2024.

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