Children with mild COVID-19 may not develop antibodies; oral vaccine booster shows promise in monkey study | Canada News Media
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Children with mild COVID-19 may not develop antibodies; oral vaccine booster shows promise in monkey study

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The following is a summary of some recent studies on COVID-19. They include research that warrants further study to corroborate the findings and that have yet to be certified by peer review.

Children with mild COVID-19 may lack  antibodies afterward

Children who contract a mild case of COVID-19 may not develop antibodies to the virus afterward, a study from Australia suggests. Researchers compared 57 children and 51 adults with mild COVID-19 or asymptomatic infections. Only 37% of children appeared to develop antibodies, compared to 76% of adults – even though viral loads were similar in the two groups, researchers found. Children’s bodies also did not appear to produce second-line cellular immune responses to the virus in the same way as adults, said study leader Paul Licciardi of Murdoch Children’s Research Institute in Melbourne. The participants in the study were all infected in 2020, his team reported on Monday on medRxiv https://bit.ly/2XuernM ahead of peer review. “Whether this also happens for the current circulating variant (Delta) requires further investigation, as well as studies to understand why children are less likely to produce antibody responses following SARS-CoV-2 Infection,” Licciardi said. “Whether this means children are susceptible to re-infection is not known.”

Experimental oral COVID-19 vaccine shows promise in monkeys

A COVID-19 booster vaccine that can be given by mouth to people who already have antibodies from vaccination or prior infection has yielded promising results in monkeys and is likely to be tested soon in humans, according to the company developing it. The oral booster uses traditional vaccine technology in which a harmless carrier virus delivers coronavirus proteins into cells on the surface of the tongue, or lining of the cheeks and throat, stimulating production of antibodies that can block the virus before it gets a foothold in the body, said Dr. Stephen Russell, chief executive of Vyriad in Rochester, Minnesota, who led the study. “Not only would an oral COVID-19 vaccine be more convenient and acceptable… but it might also lead to better immunity because it is being administered to the site where the COVID-19 virus typically comes into the body,” he added. In monkeys at one week after vaccinations, antibody levels increased by nearly 100-fold, with no side effects, Russell said. A report of the study posted on Monday on bioRxiv https://bit.ly/3vwny3T ahead of peer review says Vyriad is working with the U.S. Food and Drug Administration to plan human trials.

Plants may be useful in vaccine production

Plants could someday be used to produce COVID-19 vaccines, according to researchers who are developing a nasal spray vaccine. Vaccines work by delivering antigens, which are replicas of pieces of virus or bacteria that train the immune system to recognize the invader and defend against it. Vaccine antigens are typically produced in cells from mammals, but previous studies have suggested that producing them in tobacco-related Nicotiana benthamiana plants would be less expensive and safer. In the current lab study, posted on Monday on bioRxiv https://bit.ly/3AZwFv2 ahead of peer review, COVID-19 survivors’ antibodies recognized and responded to the coronavirus antigen produced in the plants “in the same way that they recognize a standard antigen produced in mammalian cells,” said study leader Allyson MacLean of the University of Ottawa. The intra-nasal vaccine is not meant to replace conventional (injected) vaccines, but rather to add another layer of protection by stimulating immune system protection in the airways, where the virus first attaches itself,” MacLean said. “We imagine the nasal-spray being used to top-up immune protection when traveling or going to events with large numbers of people.”

Click for a Reuters graphic https://tmsnrt.rs/3c7R3Bl on vaccines in development.

 

(Reporting by Nancy Lapid; Editing by Bill Berkrot)

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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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