Very small blood clot risk after first AstraZeneca COVID shot - UK studies | Canada News Media
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Very small blood clot risk after first AstraZeneca COVID shot – UK studies

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A large study into rare blood clots linked with AstraZeneca‘s COVID-19 vaccine found between just one and three cases per million, and only after the first dose, shedding fresh light on the side-effects from the shot.

Researchers have sought to analyse any link between COVID-19 vaccines and rare blood clots in the brain, arteries or veins – sometimes accompanied by low platelets, reports of which led many nations last year to pause use of the AstraZeneca shot, which was developed with Oxford University.

A study published in the PLOS Medicine journal on Tuesday looked at health records of 46 million adults in England between December 2020 and March 2021 to assess the risk of clots in the month after vaccination with either the Pfizer-BioNTech vaccine or AstraZeneca-Oxford shot, compared with the unvaccinated.

It was carried out by William Whiteley of the University of Edinburgh and Britain’s BHF Data Science Centre.

It found no risk of major arterial and venous thrombotic events in those aged 70 or over with either of the vaccines.

And while the risk of intracranial venous thrombosis (ICVT) following the AstraZeneca-Oxford vaccine was nearly double in those under 70, that was equal to between just one and three cases per million.

The risks of ICVT and hospitalisation with thrombocytopenia “are likely to be outweighed by the vaccines’ effect in reducing COVID-19 mortality and morbidity,” the study’s authors said.

Cases of rare blood clotting emerged early last year as the rollout of the AstraZeneca-Oxford vaccine began in Europe.

Johnson & Johnson’s COVID-19 vaccine, which is based on a similar platform to the AstraZeneca-Oxford shot, has also been associated with the rare combination of blood clotting and low platelet counts.

Some countries have restricted or suspended use of the vaccines after the EU drug regulator confirmed possible links between the shots and the conditions.

International drug regulators have said the benefits of vaccines outweigh the risks.

The study is in line with a review by the EU drug regulator which said last month there were fewer such side effects observed after the second AstraZeneca dose.

AstraZeneca said in a statement the study confirmed what is already known about “extremely rare blood disorders following vaccination.”

“The risk of developing this very rare condition remains substantially higher after COVID-19,” it added.

Last year, a study led and funded by AstraZeneca found its vaccine carried a small additional risk of thrombosis with thrombocytopenia syndrome after the first dose but none after the second.

AstraZeneca-Oxford’s ChAdOx1 nCoV-19 shot, sold under the brands Vaxzevria and Covishield with more than 2.6 billion doses supplied globally as of February, remains a key weapon against the pandemic in middle-income countries.

A second peer-reviewed British study also released on Tuesday found the risk of cerebral venous sinus thrombosis (CVST) in the four weeks after receiving the AstraZeneca-Oxford shot was roughly twice as high as before vaccination, but it still implied only one in four million people could have the side-effect.

The study assessed data for more than 11 million people in England, Scotland and Wales, spanning nearly seven months from December 2020 to June 2021.

 

(Reporting by Pushkala Aripaka in Bengaluru; Editing by Josephine Mason and Mark Potter)

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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.

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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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