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U.S. study offers reassurance on COVID-19 shots, menstrual cycles – CBC News

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One of the first studies to track whether COVID-19 vaccination might affect menstrual cycles found a small and temporary change.

Research published Wednesday tracked nearly 4,000 U.S. women through six menstrual cycles and on average, the next period after a shot started about a day later than usual. But there was no change in the number of days of menstrual bleeding after COVID-19 vaccination.

“This is incredibly reassuring,” said Dr. Alison Edelman of Oregon Health & Science University, who led the research and said it’s important to tell women what to expect.

Some women have reported irregular periods or other menstrual changes after their shots. The National Institutes of Health is funding studies to examine if there’s any link.

Edelman’s team analyzed data from a birth control app called Natural Cycles, cleared by the U.S. Food and Drug Administration for women to track their menstrual cycles and tell when they’re most likely to become pregnant.

Menstrual cycles are counted from the first day of one period to the first day of the next. Slight variations from month to month are normal — stress, diet and even exercise can spur temporary changes.

Edelman said the study included women with “the most normal of normal” cycle length, averaging between 24 and 38 days. Researchers tracked vaccinated women for three cycles before the shots and the immediate three cycles after, including the months they received a dose — and compared them to unvaccinated women. The app prompted women to enter vaccine information.

Immune system might cause period ‘hiccup’

A subset of 358 women who got both vaccine doses in the same menstrual cycle saw a slightly larger change to their next cycle length, on average two days. About 10 per cent of them had a change of eight days or more, but subsequently returned to normal ranges, the researchers reported in the journal Obstetrics & Gynecology.

Edelman said one theory is that when the immune system revs up at certain times in the cycle, “our body clock or what controls the menstrual cycle can have a hiccup.”

Dr. Nathan Stall administers a COVID-19 booster dose to Linda Pauderis as part of a campaign to bring vaccines to homebound seniors and their caregivers in Toronto Friday. The study suggested the next period after a vaccine started about a day later than usual, but there was no change in the number of days of menstruation after vaccination. (Cole Burston/The Canadian Press)

Dr. Deborah Money, a professor of obstetrics and gynecology at the University of British Columbia, agreed the findings were reassuring.

“Menstrual cycle length — even though, you know, some women will swear it’s exactly 28 days, or 29 — it varies all the time,” she said in an interview.

Stress and other factors can also affect the length of a cycle, Money said, so a one-day difference is not a big deal.

“It’s absolutely reassuring, and would suggest that there would be no impact on reproductive health or fertility related to that sort of minor shift.”

App users more likely to be white, college-educated

Money did caution that the people who use a birth control app may not be representative of the entire population.

“There’s probably some intrinsic bias to the people that are paying such close attention to their menstrual cycle.”

The study’s authors did note that that was one of its limitations.

“It may not be generalizable to the U.S. population given the selection of Natural Cycles users (more likely to be White, college educated, and have lower BMIs [body mass indexes] than national distributions and not using hormonal contraception),” the study states. They also chose to analyze a group with consistent cycle lengths, which many people who menstruate do not have. 

Edelman is planning an additional study to see if there are changes in the heaviness of menstrual bleeding or if women who have irregular periods react differently.

The findings provide “important new evidence underscoring that any impact of the COVID vaccines on menstruation is both minimal and temporary,” Dr. Christopher Zahn of the American College of Obstetricians and Gynecologists said in a statement.

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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.

The Canadian Press. All rights reserved.

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